Use of indwelling urinary catheters in nursing home residents: results from a cross-sectional study in 21 German nursing homes.

BACKGROUND: Indwelling urinary catheters often lead to complications such as symptomatic urinary tract infections. In nursing home residents, catheter prevalence is high, but prevalence differences by sociodemographic characteristics, comorbidities, and health services use have rarely been investigated. The purpose of this work was to describe the use of indwelling urinary catheters in nursing home residents and to examine whether catheter use is associated with individual characteristics. METHODS: Cross-sectional data of the "Inappropriate Medication in patients with REnal insufficiency in Nursing homes" (IMREN) study conducted in 21 German nursing homes between October 2014 and April 2015 were analyzed. For all residents of the involved care units, nurses of the participating institutions completed an anonymous questionnaire including the Modified Rankin Scale to assess physical impairments. The proportion of nursing home residents with indwelling urinary catheter was determined. Associations between catheter use and individual characteristics were investigated via cluster-adjusted multivariable logistic regression. RESULTS: Of 852 residents (76.5% female; mean age 83.5 years), 13.4% had an indwelling urinary catheter. The adjusted odds ratios for catheter use for men vs. women was 2.86 (95% confidence interval 1.82-4.50). For residents with "moderate" disability vs. those with "no to slight" disability it was 3.27 (1.36-7.85), for individuals with "moderately severe" disability vs. the reference group it was 9.03 (3.40-23.97), and for those with "severe" disability vs. the reference group it was 26.73 (8.60-83.14). For residents who had been hospitalized within the last 12 months vs. those without a hospitalization it was 1.97 (1.01-3.87). For age, dementia, overweight/obesity, other indwelling devices, and long-term medications no significant associations were found. CONCLUSIONS: Male nursing home residents, residents with a higher degree of physical impairment, and those who had been hospitalized within the last 12 months were more likely to use an indwelling urinary catheter than their counterparts. Data on circumstances of and indications for catheters, catheter types, and duration of catheterization are needed to evaluate the appropriateness of catheter use in nursing home residents and the need for interventions.

German mammography screening program: program sensitivity between 2010 and 2016 estimated based on German health claims data.

BACKGROUND: Program sensitivity is a key quality indicator for mammography screening programs (MSP). Estimating program sensitivity usually requires a linkage of screening and cancer registry data. For the German MSP, such data linkage-based estimates have only been reported for two out of 16 federal states. We aimed to explore the potential of estimating program sensitivity for the German MSP based on information available in health claims data. METHODS: We used data from the second-largest statutory health insurance fund in Germany, BARMER (~ 9 million members all over Germany). We included women aged 50 to 69 years with a non-initial screening mammography between 2010 and 2016 and followed them up for two years. We estimated the rate of screen-detected and interval cancers as well as program sensitivity. RESULTS: Per year, we included 212,400 to 303,667 women (mean age: 60-61 years). Overall, 1,992,287 non-initial MSP screening examinations conducted in these women between 2010 and 2016 were considered for the analyses. Age-standardized program sensitivity ranged between 69.9% [95% CI: 67.3-72.0%] and 71.7% [95% CI: 69.5-73.9%] during the study period. Per 1,000 non-initial screening examinations, the rate of screen-detected breast cancer ranged between 4.6 and 5.3, and the rate of interval breast cancer rates ranged between 0.6 and 0.8 for the first and between 1.3 and 1.4 for the second year after screening. CONCLUSIONS: Our results were plausible and consistent with quality indicators estimated for the German MSP based on data linkage and thus support the value of German health claims data in this regard. The quality indicators estimated in our study are in line with levels expected according to European Guidelines.

Dental care utilization among home care recipients, nursing home residents, and older adults not in need of long-term care: An observational study based on German insurance claims data.

OBJECTIVES: To describe and compare dental care utilization (DCU) among home care recipients, nursing home residents, and older adults not in need of long-term care (LTC). METHODS: Using nationwide claims data of 8 German statutory health and LTC insurance funds, proportions of home care recipients (n = 68,137), nursing home residents (n = 21,167), and non-LTC dependents (n = 632,205) aged 65+ years with DCU in 2017 were determined and compared. Associations between DCU and individual characteristics and setting were investigated via multivariable logistic regression. The proportions of individuals with DCU one year before and after transition to (a) home care (n = 23,590) and (b) nursing home care (n = 6,583) were compared. RESULTS: Proportions of home care recipients and nursing home residents with DCU were lower compared to non-LTC dependents (51.9, 53.1, and 73.2%, respectively). Adjusted odds ratios for DCU for home care recipients vs. non-LTC dependents ranged from 0.55 (LTC grades 1/2; 95% confidence interval 0.54-0.56) to 0.38 (LTC grades 4/5; 0.36-0.40). For nursing home residents vs. non-LTC dependents they ranged from 0.69 (3; 0.65-0.72) to 0.67 (4/5; 0.63-0.71). Women, older individuals, those with 0-1 diseases of the Elixhauser comorbidity index, dementia, and those from West Germany were also less likely to utilize dental care than their counterparts. Utilization decreased after transition to home care (60.0 vs. 55.6%) and increased after transition to nursing homes (46.1 vs. 53.5%). CONCLUSIONS: Nursing home residents and especially home care recipients utilized dental care less frequently than older non-LTC dependents. Organizational barriers for dental care utilization and ways to remove them should be investigated. CLINICAL SIGNIFICANCE: Dental care utilization among LTC dependents is low and should be improved in both the home care and nursing home setting.

Prevalence of indwelling urinary catheters in nursing home residents: Systematic review.

BACKGROUND: This systematic review examines the prevalence of indwelling urinary catheters in nursing home residents. METHODS: MEDLINE via PubMed, CINAHL, and EMBASE were searched from inception to 9 August 2022. Cross-sectional studies and longitudinal studies with cross-sectional analyses reporting catheter prevalence in nursing home residents were identified and summarized descriptively. Study quality was assessed using the Joanna Briggs Institute's tool. RESULTS: Sixty-seven studies (92.5 % cross-sectional) were included. The reported number of included residents ranged from 73 to 110,656. The median catheter prevalence was 7.3 % (interquartile range 4.3-10.1 %; n = 65 studies). It was higher in Germany (10.2 % [9.7-12.8 %]; n = 15) than in the United States of America (9.3 % [6.3-11.9 %]; n = 9), United Kingdom (6.9 % [4.8-8.5 %]; n = 7), and Sweden (7.3 % [6.4-7.9 %]; n = 6). Furthermore, it was higher among men (17.0 % [16.0-26.0 %]) than among women (5.3 % [4.0-9.5 %]) (n = 9). Only one study investigated differences by age. The prevalence was higher for transurethral (5.7 % [5.6-7.2 %]; n = 12) than for suprapubic (1.2 % [0.6-2.5 %]; n = 13) catheters. Most catheterized residents were long-term catheterized (n = 6) and had their catheter changed within 3 months (n = 2). Symptomatic urinary tract infections were more common among catheterized than among non-catheterized residents (n = 4). DISCUSSION: Catheter prevalence in nursing home residents varies between studies and countries. Prevalence differences by sex, age, and catheter type as well as duration of catheterization, catheter change intervals, and catheter-associated urinary tract infections are rarely reported because most studies do not primarily focus on catheters. Future studies should focus on the circumstances of urinary catheter use and care in nursing home residents. REGISTRATION AND FUNDING: PROSPERO (29 August 2022; CRD42022354358); no funding.

[Medical care with or without cooperative agreements? A cross-sectional study in nursing homes in Bremen and Lower Saxony]. / Ärztliche Versorgung mit oder ohne Kooperationsvertrag? Eine Querschnittsuntersuchung in stationären Pflegeeinrichtungen in Bremen und Niedersachsen.

BACKGROUND: Empirical studies in nursing homes show that people in need of long-term care have less contact with medical specialists (except for neurologists) compared to those of the same age who are not in need of long-term care, which can be an indication of insufficient health care provision. Against this background, a cooperative agreement between medical specialists and nursing homes was first made legally possible, then requested and finally made mandatory (section 119b SGB V [Social Code Book V] in the currently valid version). OBJECTIVE: The aim of this study is to investigate to what extent contact density to physicians and the needs-based medical treatment of nursing home residents in nursing homes with and without a cooperative agreement differ from each other and, hence, how effective such cooperation agreements are in this context. METHODOLOGY: Using data from 396 people in need of care from 44 nursing homes in Lower Saxony and Bremen we compared facilities with and without cooperative agreements with respect to the number of home visits, practice visits and telephone contacts and the realization of adequate specialist medical treatment. At the time of the survey, 26 of the 44 nursing homes had cooperative agreements with dentists, 17 with general practitioners and 7 with neurologists. RESULTS: The number of personal contacts to general practitioners tends to be higher if cooperation agreements between general practitioners and nursing homes exist. In nursing homes having cooperation agreements with dentists the number of home visits is twice as high as in nursing homes without such an agreement, whereas cooperation agreements with neurologists have no effect on the number of contacts with these specialists. Furthermore, cooperation agreements with dentists promote appropriate dental care. CONCLUSIONS: The results show that cooperation agreements can be a useful instrument to ensure medical care in nursing homes. To guarantee the effectiveness of the cooperation agreements, however, the number of medical visits should be stipulated in the agreements.

Effectiveness of Mammography Screening on Breast Cancer Mortality - A Study Protocol for Emulation of Target Trials Using German Health Claims Data.

Background: The efficacy of mammography screening in reducing breast cancer mortality has been demonstrated in randomized trials. However, treatment options - and hence prognosis - for advanced tumor stages as well as mammography techniques have considerably improved since completion of these trials. Consequently, the effectiveness of mammography screening under current conditions is unclear and controversial. The German mammography screening program (MSP), an organized population-based screening program, was gradually introduced between 2005 and 2008 and achieved nation-wide coverage in 2009. Objective: We describe in detail a study protocol for investigating the effectiveness of the German MSP in reducing breast cancer mortality in women aged 50 to 69 years based on health claims data. Specifically, the proposed study aims at estimating per-protocol effects of several screening strategies on cumulative breast cancer mortality. The first analysis will be conducted once 10-year follow-up data are available. Methods and Analysis: We will use claims data from five statutory health insurance providers in Germany, covering approximately 37.6 million individuals. To estimate the effectiveness of the MSP, hypothetical target trials will be emulated across time, an approach that has been demonstrated to minimize design-related biases. Specifically, the primary contrast will be in terms of the cumulative breast cancer mortality comparing the screening strategies of "never screen" versus "regular screening as intended by the MSP". Ethics and Dissemination: In Germany, the utilization of data from health insurances for scientific research is regulated by the Code of Social Law. All involved health insurance providers as well as the responsible authorities approved the use of the health claims data for this study. The Ethics Committee of the University of Bremen determined that studies based on claims data are exempt from institutional review. The findings of the proposed study will be published in peer-reviewed journals.

Generalizability and reach of a randomized controlled trial to improve oral health among home care recipients: comparing participants and nonparticipants at baseline and during follow-up.

BACKGROUND: The generalizability of randomized controlled trials (RCTs) with a low response can be limited by systematic differences between participants and nonparticipants. This participation bias, however, is rarely investigated because data on nonparticipants is usually not available. The purpose of this article is to compare all participants and nonparticipants of a RCT to improve oral health among home care recipients at baseline and during follow-up using claims data. METHODS: Seven German statutory health and long-term care insurance funds invited 9656 home care recipients to participate in the RCT MundPflege. Claims data for all participants (n = 527, 5.5% response) and nonparticipants (n = 9129) were analyzed. Associations between trial participation and sex, age, care dependency, number of Elixhauser diseases, and dementia, as well as nursing, medical, and dental care utilization at baseline, were investigated using multivariable logistic regression. Associations between trial participation and the probability of (a) moving into a nursing home, (b) being hospitalized, and (c) death during 1 year of follow-up were examined via Cox proportional hazards regressions, controlling for baseline variables. RESULTS: At baseline, trial participation was positively associated with male sex (odds ratio 1.29 [95% confidence interval 1.08-1.54]), high (vs. low 1.46 [1.15-1.86]) care dependency, receiving occasional in-kind benefits to relieve caring relatives (1.45 [1.15-1.84]), having a referral by a general practitioner to a medical specialist (1.62 [1.21-2.18]), and dental care utilization (2.02 [1.67-2.45]). It was negatively associated with being 75-84 (vs. < 60 0.67 [0.50-0.90]) and 85 + (0.50 [0.37-0.69]) years old. For morbidity, hospitalizations, and formal, respite, short-term, and day or night care, no associations were found. During follow-up, participants were less likely to move into a nursing home than nonparticipants (hazard ratio 0.50 [0.32-0.79]). For hospitalizations and mortality, no associations were found. CONCLUSIONS: For half of the comparisons, differences between participants and nonparticipants were observed. The RCT's generalizability is limited, but to a smaller extent than one would expect because of the low response. Routine data provide a valuable source for investigating potential differences between trial participants and nonparticipants, which might be used by future RCTs to evaluate the generalizability of their findings. TRIAL REGISTRATION: German Clinical Trials Register DRKS00013517 . Retrospectively registered on June 11, 2018.

Contacts with general practitioners, dentists, and medical specialists among nursing home residents: a cross-sectional study in 44 German nursing homes.

BACKGROUND: Nursing home residents have high medical care needs. Their medical care utilization is, however, lower compared to community-dwelling elderly and varies widely among nursing homes. This study quantified the utilization of general practitioners (GPs), dentists, and medical specialists among nursing homes and residents, and investigated whether dentist utilization is associated with individual and nursing home characteristics. METHODS: Forty-four nursing homes invited 2124 residents to participate in a cross-sectional study. For 10 medical specialties, data on contacts in nursing homes, practices, and by telephone in the last 12 months were assessed at individual and nursing home level. The proportion of nursing homes and residents with any form of contact, and the median number and interquartile range (IQR) of contacts among individuals with contact were determined. Using multilevel logistic regression, associations between the probability of individual dental care utilization and sex, age, LTC grade, years of residence, sponsorship, number of nursing home beds, and transport and medical escort services for consultations at a practice were investigated. RESULTS: The proportion of nursing homes with any form of contact with physicians ranged from 100% for GPs, dentists, and urologists to 76.7% for gynecologists and orthopedists. Among the nursing homes, 442 residents participated (20.8% response). The proportion of residents with any contact varied from 97.8% for GPs, 38.5% for neurologists/psychiatrists, and 32.3% for dentists to 3.0% for gynecologists. Only for GPs, neurologists/psychiatrists, dentists, otorhinolaryngologists, urologists, and dermatologists, the proportion was higher for nursing home contacts than for practice and telephone contacts. Among residents with any contact, the median number of contacts was highest for GPs (11.0 [IQR 7.0-16.0]), urologists (4.0 [IQR 2.0-7.0]), and neurologists/psychiatrists (3.0 [IQR 2.0-5.0]). Dentist utilization varied widely among nursing homes (median odds ratio 2.5) and was associated with higher age. CONCLUSIONS: Almost all residents had regular contact to GPs, but only one third had contact with dentists. Lower proportions with contact were found for medical specialists, except for neurologists/psychiatrists. Reasons for the large variations in dental care utilization among nursing homes should be identified. TRIAL REGISTRATION: DRKS00012383 [2017/12/06].

Effectiveness of a Dental Intervention to Improve Oral Health among Home Care Recipients: A Randomized Controlled Trial.

We quantified the effectiveness of an oral health intervention among home care recipients. Seven German insurance funds invited home care recipients to participate in a two-arm randomized controlled trial. At t0, the treatment group (TG) received an intervention comprising an oral health assessment, dental treatment recommendations and oral health education. The control group (CG) received usual care. At t1, blinded observers assessed objective (Oral Health Assessment Tool (OHAT)) and subjective (Oral Health Impact Profile (OHIP)) oral health and the objective periodontal situation (Periodontal Screening Index (PSI)). Of 9656 invited individuals, 527 (5.5%) participated. In the TG, 164 of 259 (63.3%) participants received the intervention and 112 (43.2%) received an outcome assessment. In the CG, 137 of 268 (51.1%) participants received an outcome assessment. The OHAT mean score (2.83 vs. 3.31, p = 0.0665) and the OHIP mean score (8.92 vs. 7.99, p = 0.1884) did not differ significantly. The prevalence of any periodontal problems (77.1% vs. 92.0%, p = 0.0027) was significantly lower in the TG than in the CG, but the prevalence of periodontitis was not (35.4% vs. 44.6%, p = 0.1764). Future studies should investigate whether other recruitment strategies and a more comprehensive intervention might be more successful in improving oral health among home care recipients.

[Medical specialist undertreatment in nursing home residents-Prevalence and extrapolation]. / Fachärztliche Unterversorgung bei Heimbewohnern ­ Prävalenzstudie und Hochrechnung.

BACKGROUND: Nursing home residents tend to have lower medical specialist utilization than other groups of older people; however, as yet there is little evidence whether nursing home residents obtain adequate medical specialist care. This study investigated whether nursing home residents receive adequate oral health care, ophthalmological care, otorhinolaryngologist care and neurological care. The unmet needs of the nursing home population in Germany was extrapolated. MATERIAL AND METHODS: Audiometry, eye examinations and oral visual inspection were performed in 409 residents from 44 nursing homes. Medical care in the previous 12 months as well as existing diagnoses were retrieved from the nursing documentation. Teams of physicians evaluated for each resident based on all collected data if the resident obtained specialist care that was adequate to the needs. RESULTS: Between 15% and 45% of the residents with need for medical specialist care did not receive adequate specialist care. Of all residents 27% had unmet need of specialist care in at least one of the investigated medical specialties. It is projected that up to 205,000 nursing home residents in Germany do not receive adequate medical specialist care. CONCLUSION: Given a considerable proportion of nursing home residents with unmet need of specialist care, interventions should be developed that help reduce the level of unmet needs.

Home care recipients have poorer oral health than nursing home residents: Results from two German studies.

OBJECTIVES: To describe and compare the objective and subjective oral health of older nursing home residents and home care recipients, and to investigate whether oral health is associated with sociodemographic characteristics and the long-term care (LTC) setting. METHODS: In two German studies, the oral health of 246 nursing home residents and 90 home care recipients aged ≥60 years was assessed objectively using the Oral Health Assessment Tool (OHAT) and subjectively using the Oral Health Impact Profile (OHIP). OHAT and OHIP scores were compared between both settings. Multivariable logistic regressions were applied to investigate whether oral health is associated with sex, age group, LTC grade, and LTC setting. RESULTS: OHAT and OHIP mean scores in the home care setting were higher compared to the nursing home setting (OHAT: 3.13 vs. 1.28, p < .0001; OHIP: 7.81 vs. 2.15, p < .0001). The adjusted odds ratios for poor objective and subjective oral health for home care recipients vs. nursing home residents were 6.71 (95 % confidence interval 3.29-13.69) and 4.92 (2.77-8.76). No significant associations with sociodemographic characteristics were found. CONCLUSIONS: Oral health was poor in both settings, but home care recipients were more likely to have poor oral health than nursing home residents. Interventions to improve oral health are needed in the nursing home setting and, even more importantly, in the home care setting. CLINICAL SIGNIFICANCE: Oral health among older people in need of LTC is poor and should be improved. From a health policy perspective, home care recipients may need more attention.

[Prevalence and Treatment of Posttraumatic Stress Disorder in Germany: An Analysis of Nationwide Health Insurance Data, 2008 vs 2017]. / Prävalenz und Versorgung der Posttraumatischen Belastungsstörung in Deutschland: Eine bundesweite Auswertung von Krankenkassendaten aus den Jahren 2008 und 2017.

OBJECTIVE: To provide German data regarding prevalence and treatment (pharmacotherapy, psychotherapy) for individuals with PTSD. METHODS: Based on BARMER health insurance data, the administrative prevalence of PTSD (ICD-10: F43.1), psychiatric comorbidity, psychotherapy and pharmacotherapy were estimated. Additionally, prevalence trends for years 2008 vs. 2017 were computed. RESULTS: In 2017, the overall PTSD prevalence was 0.7 % (females: 0.9 %, males: 0.4 %), whereas in 2008 it was 0.3 %. 74.4 % of all PTSD cases received psychotherapy, 43.6 % were prescribed an antidepressant (first choice: venlafaxine), and 14.4 % were prescribed an antipsychotic (first choice: quetiapine). CONCLUSION: Within the studied period, the administrative prevalence of PTSD has more than doubled. Still, the prevalence rate found in our study is lower than figures from epidemiological studies, thus indicating room for improvement in diagnosing PTSD.

Claims data analysis of medical specialist utilization among nursing home residents and community-dwelling older people.

BACKGROUND: Most older people, and especially those in need of long-term care, suffer from one or more chronic diseases. Consequently, older people have an increased need of medical care, including specialist care. There is little evidence as yet whether older people with greater medical care needs obtain adequate medical care because existing studies do not sufficiently control for differences in morbidity. In this study we investigate whether differences in medical specialist utilization exist between older people with and without assessed long-term care need in line with Book XI of the German Social Code, while at the same time controlling for individual differences in morbidity. METHODS: We used data from the 11 German AOK Statutory Health and Long-term Care Insurance funds of 100,000 members aged 60 years or over. Zero-inflated Poisson regression analyses were applied to investigate whether the need for long-term care and the long-term care setting are associated with the probability and number of specialist visits. We controlled for age, gender, morbidity and mortality, residential density, and general practitioner (GP) utilization. RESULTS: Older people in need of long-term care are more likely to have no specialist visit than people without the need for long-term care. This applies to nearly all medical specialties and for both care settings. Yet, despite these differences in utilization probability the number of specialist medical care visits between older people with and without the need for long-term care is similar. CONCLUSION: Older people in need of long-term care might face access barriers to specialist care. Once a contact is established, however, utilization does not differ considerably between those who need long-term care and those who don't; this indicates the importance of securing an initial contact.

Differences in medical specialist utilization among older people in need of long-term care - results from German health claims data.

BACKGROUND: Elderly in need of long-term care tend to have worse health and have higher need of medical care than elderly without need for long-term care. Yet, characteristics associated with long-term care need can impede health care access: Higher levels of long-term care need come with physical and cognitive decline such as frailty and memory loss. Yet, it has not been investigated whether level of long-term care need is related to medical care utilization. METHODS: We investigated the association between the level of long-term care and medical specialist utilization among nursing home residents and home care recipients. We applied zero-inflated Poisson regression with robust standard errors based on a sample of statutory health insurance members. The sample consisted of 100.000 elderly over age 60. We controlled for age, gender, morbidity and mortality, residential density, and general practitioner utilization. RESULTS: We found a strong gradient effect of the level of long-term care for 9 out of 12 medical specialties: A higher level of long-term care need was associated with a lower probability of having a medical specialist visit. Yet, we did not find clear effects of the level of long-term care need on the intensity of medical specialist care. These findings were similar for both the nursing home and home care setting. CONCLUSION: The findings indicate that inequalities in medical specialist utilization exist between elderly with differing levels of long-term care need because differences in morbidity were controlled for. Elderly with higher need of long-term care might face more access barriers to specialist medical care.

Linkage of Routine Data to Other Data Sources in Germany: A Practical Example Illustrating Challenges and Solutions.

Routine data have a high potential for epidemiological and health care research but lack information, for instance, on the cause of death. Often detailed information, such as on lifestyle factors is also missing. In Germany, obtaining the missing information by linkage to data sources is challenging, mainly due to strict data protection regulations. One key challenge arises from the fact that routine data users usually have no access to person identifiers which would be necessary for record linkage. A second key challenge is that sensitive information (i. e., the cause of death) should not be transferred to an institution that holds person identifiers. In this paper, we illustrate these key challenges and present corresponding solutions based on a practical example where claims data from statutory health insurance providers are linked to an epidemiological cancer registry to obtain cause of death information. We describe the approval procedures necessary for the record linkage, the dataflow between the involved institutions and explain the rationale of the dataflow in view of the key challenges. Finally, we generalize the questions that need to be addressed when a record linkage is planned and point to additional potential challenges. Overall, we illustrate that a linkage between routine data and other data sources in Germany is feasible, but specific restrictions and hurdles need to be taken into consideration.

Assessing and Explaining Geographic Variations in Mammography Screening Participation and Breast Cancer Incidence.

Investigating geographic variations in mammography screening participation and breast cancer incidence help improve prevention strategies to reduce the burden of breast cancer. This study examined the suitability of health insurance claims data for assessing and explaining geographic variations in mammography screening participation and breast cancer incidence at the district level. Based on screening unit data (1,181,212 mammography screening events), cancer registry data (13,241 incident breast cancer cases) and claims data (147,325 mammography screening events; 1,778 incident breast cancer cases), screening unit and claims-based standardized participation ratios (SPR) of mammography screening as well as cancer registry and claims-based standardized incidence ratios (SIR) of breast cancer between 2011 and 2014 were estimated for the 46 districts of the German federal state of Lower Saxony. Bland-Altman analyses were performed to benchmark claims-based SPR and SIR against screening unit and cancer registry data. Determinants of district-level variations were investigated at the individual and contextual level using claims-based multilevel logistic regression analysis. In claims and benchmark data, SPR showed considerable variations and SIR hardly any. Claims-based estimates were between 0.13 below and 0.14 above (SPR), and between 0.36 below and 0.36 above (SIR) the benchmark. Given the limited suitability of health insurance claims data for assessing geographic variations in breast cancer incidence, only mammography screening participation was investigated in the multilevel analysis. At the individual level, 10 of 31 Elixhauser comorbidities were negatively and 11 positively associated with mammography screening participation. Age and comorbidities did not contribute to the explanation of geographic variations. At the contextual level, unemployment rate was negatively and the proportion of employees with an academic degree positively associated with mammography screening participation. Unemployment, income, education, foreign population and type of district explained 58.5% of geographic variations. Future studies should combine health insurance claims data with individual data on socioeconomic characteristics, lifestyle factors, psychological factors, quality of life and health literacy as well as contextual data on socioeconomic characteristics and accessibility of mammography screening. This would allow a comprehensive investigation of geographic variations in mammography screening participation and help to further improve prevention strategies for reducing the burden of breast cancer.

Needs-based provision of medical care to nursing home residents: protocol for a mixed-methods study.

INTRODUCTION: Nursing home residents typically have greater needs for medical care than community-dwelling elderly. However, restricted cognitive abilities and limited mobility may impede their access to general practitioners and medical specialists. The provision of medical care in nursing homes may therefore be inappropriate in some areas of medical care. The purpose of this mixed-methods study is to systematically assess, evaluate and explain met and unmet medical care needs in German nursing homes and to develop solutions where medical care is found to be inappropriate. METHODS AND ANALYSIS: First, statutory health insurance claims data are analysed to identify differences in the utilisation of medical care between nursing home residents and community-dwelling elderly with and without need for long-term care. Second, the health status and medical care of 500 nursing home residents are assessed and evaluated to quantify met and unmet medical care needs. Third, qualitative expert interviews and case conferences and, fourth, quantitative analyses of linked data are used to provide structural, case-specific and generalisable explanations of inappropriate medical care among nursing home residents. Fifth, a modified Delphi study is employed to develop pilot projects aiming to improve medical care in nursing homes. ETHICS AND DISSEMINATION: This study was approved by the Ethics Committee of the University of Bremen on 23 November 2017. Research findings are disseminated through presentations at national and international conferences and publications in peer-reviewed scientific journals. TRIAL REGISTRATION NUMBER: DRKS00012383.

Implementation of an algorithm for the identification of breast cancer deaths in German health insurance claims data: a validation study based on a record linkage with administrative mortality data.

OBJECTIVE: To adapt a Canadian algorithm for the identification of female cases of breast cancer (BC) deaths to German health insurance claims data and to test and validate the algorithm by comparing results with official cause of death (CoD) data on the individual and the population level. DESIGN: Validation study, secondary data, medical claims. SETTING: Claims data of two statutory health insurance providers (SHIs) for inpatient and outpatient care, CoD added via record linkage with epidemiological cancer registry (ECR).ParticipantsAll women insured with the two SHIs and who deceased in the period 2006-2013, were residents of North Rhine Westphalia (NRW) and were linked with ECR data: n=22 413. MAIN OUTCOME MEASURES: Based on inpatient and outpatient diagnoses in the year before death, six algorithms were derived and the accordance of the algorithm-based CoD with the official CoD was evaluated calculating specificity, sensitivity, negative and positive predictive values (NPV, PPV). Furthermore, algorithm-based age-specific BC mortality rates covering several calendar years were calculated for the entire insured female population and compared with official national rates. RESULTS: Our final algorithm, derived from the NRW subsample, comprised codes indicating the presence of BC, metastases, a terminal illness phase and the absence of codes for other tumours. Overall, specificity, sensitivity, NPV and PPV of this algorithm were 97.4%, 91.3%, 98.9% and 81.7%, respectively. In the age range 40-80 years, sensitivity and PPV slightly decreased with increasing age. Algorithm-based age-specific BC mortality rates agreed well with official rates except for the age group 85 years and older. CONCLUSIONS: The algorithm-based identification of BC deaths in German claims data is feasible and valid, except for higher ages. The algorithm to ascertain BC mortality rates in an epidemiological study seems applicable when information on the official CoD is not available in the original database.

A cohort study of mammography screening finds that comorbidity measures are insufficient for controlling selection bias.

OBJECTIVE: To examine the potential of claims-based comorbidity measures for controlling selection bias in observational studies of mammography screening. STUDY DESIGN AND SETTING: Based on claims data of a large German Statutory Health Insurance fund, the single comorbidities considered by the Charlson, Elixhauser, Multipurpose Australian Comorbidity Scoring System, and M3 comorbidity measures were identified for mammography screening participants and nonparticipants. Total death rates within 4 years after screening invitation were compared. Cox proportional hazards regressions were performed unadjusted and adjusted for age, federal state of residence, and comorbidity. RESULTS: Among 1,247,919 insured women aged 50-68 years (56.2% participants), 10,311 participants (death rate 375.8/100,000 person-years) and 18,113 nonparticipants (death rate 854.8/100,000 person-years) died from any cause during the follow-up. The unadjusted hazard ratio (HR) for death from any cause for participants vs. nonparticipants was 0.44 (99.9% confidence interval 0.42-0.46). Adjustments attenuated the HR to a maximum of 0.52 (0.50-0.54). CONCLUSION: The lower short-term all-cause mortality among participants cannot be explained by mammography screening effects and should be interpreted as selection bias. Adjusting for comorbidities only slightly attenuated this bias. Future studies should examine whether claims data include further information that is beneficial to adequately control selection bias in observational studies of mammography screening.

The impact of the lookback period and definition of confirmatory events on the identification of incident cancer cases in administrative data.

BACKGROUND: This cohort study examined the impact of the lengths of lookback and confirmation periods as well as the definition of confirmatory events on the number of incident cancer cases identified and age-standardized cumulative incidences (ACI) estimated in administrative data using German cancer registry data as a benchmark. METHODS: ACI per 100,000 insured persons for breast, prostate and colorectal cancer were estimated using BARMER Statutory Health Insurance claims data. Incident cancer cases were defined as having an in- or outpatient diagnosis in 2013, no diagnosis in a lookback period of 1 year and a second diagnosis (or death) in a confirmation period of 1 quarter. We varied lookback periods from 1 to 7 years, confirmation periods from 1 to 4 quarters as well as the definition of confirmatory events and compared ACI estimates to cancer registry data. RESULTS: ACI were higher for breast (138.7) and prostate (103.6) but lower for colorectal cancer (42.1) when compared to cancer registries (119.3, 98.0 and 45.5, respectively). Extending the lookback period to 7 years reduced ACI to 129.0, 95.1 and 38.3. An extended confirmation period of 4 quarters increased ACI to 151.3, 114.9 and 46.8. Including breast and colorectal surgeries as a confirmatory event reduced ACI to 114.9 and 37.1, respectively. CONCLUSIONS: The choice of lookback and confirmation periods and the definition of confirmatory events have considerable impact on the number of incident cancer cases identified and ACI estimated. Researchers need to be aware of potential misclassification when identifying incident cancer cases in administrative data. Further validation studies as well as studies using administrative data to estimate cancer incidences should consider several choices of the lookback and confirmation periods and the definition of confirmatory events to show how these parameters impact the validity and robustness of their results.