Longitudinal participation in delivery and payment reform programs among US Primary Care Organizations.

OBJECTIVE: To assess longitudinal primary care organization participation patterns in large-scale reform programs and identify organizational characteristics associated with multiprogram participation. DATA SOURCES: Secondary data analysis of national program participation data over an eight-year period (2009-2016). STUDY DESIGN: We conducted a retrospective, observational study by creating a unique set of data linkages (including Medicare and Medicaid Meaningful Use and Medicare Shared Savings Program Accountable Care Organization (MSSP ACO) participation from CMS, Patient-Centered Medical Home (PCMH) participation from the National Committee for Quality Assurance, and organizational characteristics) to measure longitudinal participation and identify what types of organizations participate in one or more of these reform programs. We used multivariate models to identify organizational characteristics that differentiate those that participate in none, one, or two-to-three programs. DATA EXTRACTION METHODS: We used Medicare claims to identify organizations that delivered primary care services (n = 56 ,287) and then linked organizations to program participation data and characteristics. PRINCIPAL FINDINGS: No program achieved more than 50% participation across the 56,287 organizations in a given year, and participation levels flattened or decreased in later years. 36% of organizations did not participate in any program over the eight-year study period; 50% participated in one; 13% in two; and 1% in all three. 14.31% of organizations participated in five or more years of Meaningful Use while 3.84% of organizations participated in five years of the MSSP ACO Program and 0.64% participated in at least five years of PCMH. Larger organizations, those with younger providers, those with more primary care providers, and those with larger Medicare patient panels were more likely to participate in more programs. CONCLUSIONS AND RELEVANCE: Primary care transformation via use of voluntary programs, each with their own participation requirements and approach to incentives, has failed to broadly engage primary care organizations. Those that have chosen to participate in multiple programs are likely those already providing high-quality care.

The Path Forward: Using Metrics to Promote Equitable Work Environments.

Women continue to be underrepresented in medicine, especially in senior leadership positions, and they experience challenges related to gender bias and sexual harassment. Women who are members of multiple groups that experience marginalization, including, for example, women who are American Indian, Alaskan native, indigenous, Black, or Hispanic, face a compounded challenge. In this article, we explore how institutions and professional organizations in medicine can use metrics to better understand the structural disparities that create and promote gender inequity in the work environment and how to employ these metrics to track progress in narrowing these gaps. Examples in health care (clinical medicine, scientific organizations, scientific publishing), business, and law are used to illustrate how impactful metrics can promote accountability when coupled with transparent reporting.

Assessment of Benchmark Dose in BEAS-2B Cells by Evaluating the Cell Relative Viability with Particulates in Motorcycle Exhaust via the Air-liquid Interface Exposure.

OBJECTIVE: This study aimed to use an air-liquid interface (ALI) exposure system to simulate the inhalation exposure of motorcycle exhaust particulates (MEPs) and then investigate the benchmark dose (BMD) of MEPs by evaluating cell relative viability (CRV) in lung epithelial BEAS-2B cells. METHODS: The MEPs dose was characterized by measuring the number concentration (NC), surface area concentration (SAC), and mass concentration (MC). BEAS-2B cells were exposed to MEPs at different concentrations via ALI and CRV was determined using Cell Counting Kit (CCK-8) assay. BMD software was applied to calculate BMD and the lower limit of benchmark dose (BMDL) according to Akaike Information Coefficient (AIC), with P-value based on Hill, Linear, Polynomial, and Power model. RESULTS: Our results reveal that BMD of NC and SAC were estimated by the best-fitting Hill model, while MC was estimated by Polynomial model. The BMDL for CRV following ALI exposure to MEPs were as follows: 364.2#/cm 3 for NC; 0.662 × 10 7 nm 2/cm 3 for SAC; and 0.278 µg/m 3 for MC. CONCLUSION: These results indicate that MEPs exposure via ALI system induces a dose-dependent decrease of CRV and provides the potential exposure threshold of MEPs in a lung cell model.

The Effect of Including Benchmark Prevalence Data of Common Imaging Findings in Spine Image Reports on Health Care Utilization Among Adults Undergoing Spine Imaging: A Stepped-Wedge Randomized Clinical Trial.

Importance: Lumbar spine imaging frequently reveals findings that may seem alarming but are likely unrelated to pain. Prior work has suggested that inserting data on the prevalence of imaging findings among asymptomatic individuals into spine imaging reports may reduce unnecessary subsequent interventions. Objective: To evaluate the impact of including benchmark prevalence data in routine spinal imaging reports on subsequent spine-related health care utilization and opioid prescriptions. Design, Setting, and Participants: This stepped-wedge, pragmatic randomized clinical trial included 250 401 adult participants receiving care from 98 primary care clinics at 4 large health systems in the United States. Participants had imaging of their backs between October 2013 and September 2016 without having had spine imaging in the prior year. Data analysis was conducted from November 2018 to October 2019. Interventions: Either standard lumbar spine imaging reports (control group) or reports containing age-appropriate prevalence data for common imaging findings in individuals without back pain (intervention group). Main Outcomes and Measures: Health care utilization was measured in spine-related relative value units (RVUs) within 365 days of index imaging. The number of subsequent opioid prescriptions written by a primary care clinician was a secondary outcome, and prespecified subgroup analyses examined results by imaging modality. Results: We enrolled 250 401 participants (of whom 238 886 [95.4%] met eligibility for this analysis, with 137 373 [57.5%] women and 105 497 [44.2%] aged >60 years) from 3278 primary care clinicians. A total of 117 455 patients (49.2%) were randomized to the control group, and 121 431 patients (50.8%) were randomized to the intervention group. There was no significant difference in cumulative spine-related RVUs comparing intervention and control conditions through 365 days. The adjusted median (interquartile range) RVU for the control group was 3.56 (2.71-5.12) compared with 3.53 (2.68-5.08) for the intervention group (difference, -0.7%; 95% CI, -2.9% to 1.5%; P = .54). Rates of subsequent RVUs did not differ between groups by specific clinical findings in the report but did differ by type of index imaging (eg, computed tomography: difference, -29.3%; 95% CI, -42.1% to -13.5%; magnetic resonance imaging: difference, -3.4%; 95% CI, -8.3% to 1.8%). We observed a small but significant decrease in the likelihood of opioid prescribing from a study clinician within 1 year of the intervention (odds ratio, 0.95; 95% CI, 0.91 to 1.00; P = .04). Conclusions and Relevance: In this study, inserting benchmark prevalence information in lumbar spine imaging reports did not decrease subsequent spine-related RVUs but did reduce subsequent opioid prescriptions. The intervention text is simple, inexpensive, and easily implemented. Trial Registration: ClinicalTrials.gov Identifier: NCT02015455.

Benchmarking Site of Death and Hospice Use: A Case Study of Veterans Cared by Department of Veterans Affairs Home-based Primary Care.

OBJECTIVE: The objective of this study was to examine site of death and hospice use, identifying potential disparities among veterans dying in Department of Veterans Affairs (VA) Home Based Primary Care (VA-HBPC). METHODS: Administrative data (2008, 2012, and 2016) were compiled using the VA Residential-History-File which tracks health care service location, daily. Outcomes were site of death [home, nursing home (NH), hospital, inpatient hospice]; and hospice use on the day of death. We compared VA-HBPC rates to rates of 2 decedent benchmarks: VA patients and 5% Traditional Medicare non-veteran males. Potential age, race, urban/rural residence and living alone status disparities in rates among veterans dying in VA-HBPC in 2016 were examined by multinomial logistic regression. RESULTS: In 2016, 7796 veterans died in VA-HBPC of whom 62.1% died at home, 11.8% in NHs, 14.7% in hospitals and 11.4% in inpatient hospice. Hospice was provided to 60.9% of veterans dying at home and 63.9% of veterans dying in NH. Over the 2008-2012-2016 period, rates of VA-HBPC veterans who died at home and rates of home death with hospice increased and were higher than both benchmarks. Among VA-HBPC decedents, younger/older veterans were more/less likely to die at home and less/more likely to die with hospice. Race/ethnicity and urban/rural residence were unrelated to death at home but veterans living alone were less likely to die at home. CONCLUSIONS: Results reflect VA-HBPC's primary goal of supporting its veterans at home, including at the end-of-life, surpassing other population benchmarks with some potential disparities remaining.

A cross-industry forum on benchmarking critical quality attribute identification and linkage to process characterization studies.

Identification of Critical Quality Attributes (CQAs) and subsequent characterization in process development studies are the key elements of quality by design (QbD) for biopharmaceutical products. Since the inception of ICH Q8R2, several articles have been published on approaches to conducting CQA risk assessments as well as the application to process understanding. A survey was conducted by multiple companies participating in an International Consortium working group on the best practices for identifying CQAs with linkages to process characterization (PC) studies. The results indicate that the companies surveyed are using similar approaches/timing to identify CQAs during process development. Consensus was also observed among the companies surveyed with approaches to linkage of CQAs to process characterization studies leading to impact to control strategies and lifecycle management.

Benchmarking the value of care: Variability in hospital costs for common operations and its association with procedure volume.

BACKGROUND: Efforts to improve health care value (quality/cost) have become a priority in the United States. Although many seek to increase quality by reducing variability in adverse outcomes, less is known about variability in costs. In conjunction with the American Association for the Surgery of Trauma Healthcare Economics Committee, the objective of this study was to examine the extent of variability in total hospital costs for two common procedures: laparoscopic appendectomy (LA) and laparoscopic cholecystectomy (LC). METHODS: Nationally weighted data for adults 18 years and older was obtained for patients undergoing each operation in the 2014 and 2016 National Inpatient Sample. Data were aggregated at the hospital-level to attain hospital-specific median index hospital costs in 2019 US dollars and corresponding annual procedure volumes. Cost variation was assessed using caterpillar plots and risk-standardized observed/expected cost ratios. Correlation analysis, variance decomposition, and regression analysis explored costs' association with volume. RESULTS: In 2016, 1,563 hospitals representing 86,170 LA and 2,276 hospitals representing 230,120 LC met the inclusion criteria. In 2014, the numbers were similar (1,602 and 2,259 hospitals). Compared with a mean of US $10,202, LA median costs ranged from US $2,850 to US $33,381. Laparoscopic cholecystectomy median costs ranged from US $4,406 to US $40,585 with a mean of US $12,567. Differences in cost strongly associated with procedure volume. Volume accounted for 9.9% (LA) and 12.4% (LC) of variation between hospitals, after controlling for the influence of other hospital (8.2% and 5.0%) and patient (6.3% and 3.7%) characteristics and in-hospital complications (0.8% and 0.4%). Counterfactual modeling suggests that were all hospitals to have performed at or below their expected median cost, one would see a national cost savings of greater than US $301.9 million per year (95% confidence interval, US $280.6-325.5 million). CONCLUSION: Marked variability of median hospital costs for common operations exists. Differences remained consistent across changing coding structures and database years and were strongly associated with volume. Taken together, the findings suggest room for improvement in emergency general surgery and a need to address large discrepancies in an often-overlooked aspect of value. LEVEL OF EVIDENCE: Epidemiological, level III.

End-of-life quality metrics among medicare decedents at minority-serving cancer centers: A retrospective study.

BACKGROUND: We calculated the performance of National Cancer Institute (NCI)/National Comprehensive Cancer Network (NCCN) cancer centers' end-of-life (EOL) quality metrics among minority and white decedents to explore center-attributable sources of EOL disparities. METHODS: We conducted a retrospective cohort study of Medicare beneficiaries with poor-prognosis cancers who died between April 1, 2016 and December 31, 2016 and had any inpatient services in the last 6 months of life. We attributed patients' EOL treatment to the center at which they received the preponderance of EOL inpatient services and calculated eight risk-adjusted metrics of EOL quality (hospice admission ≤3 days before death; chemotherapy last 14 days of life; ≥2 emergency department (ED) visits; intensive care unit (ICU) admission; or life-sustaining treatment last 30 days; hospice referral; palliative care; advance care planning last 6 months). We compared performance between patients across and within centers. RESULTS: Among 126,434 patients, 10,119 received treatment at one of 54 NCI/NCCN centers. In aggregate, performance was worse among minorities for ED visits (10.3% vs 7.4%, P < .01), ICU admissions (32.9% vs 30.4%, P = .03), no hospice referral (39.5% vs 37.0%, P = .03), and life-sustaining treatment (19.4% vs 16.2%, P < .01). Despite high within-center correlation for minority and white metrics (0.61-0.79; P < .01), five metrics demonstrated worse performance as the concentration of minorities increased: ED visits (P = .03), ICU admission (P < .01), no hospice referral (P < .01), and life-sustaining treatments (P < .01). CONCLUSION: EOL quality metrics vary across NCI/NCCN centers. Within center, care was similar for minority and white patients. Minority-serving centers had worse performance on many metrics.

Surgeon work captured by the National Surgical Quality Improvement Program across specialties.

BACKGROUND: The National Surgical Quality Improvement Program (NSQIP) database is increasingly used for surgical research. However, it is unclear how well this database represents the breadth of work performed by different specialties. METHODS: Using the 2017 NSQIP participant use file and the 2017 Medicare Physician/Supplier Procedure Summary file, we evaluated (1) what proportion of surgical work is captured by NSQIP, (2) what procedures and disciplines are undersampled, and (3) the overall concordance between the NSQIP sample and a national sample. RESULTS: The NSQIP database reported at least one case for 4,463 out of the 5,272 Current Procedures Terminology codes in the Medicare file, potentially capturing 97.8% of surgical work across all 10 specialties. However, this proportion decreased to 72.1% when only procedures with at least 100 cases in NSQIP were considered. Limiting our analysis to only those procedures with 100 cases had markedly different effects by specialty. In part, this was owing to undersampling of minor procedures, which are more common in disciplines such as otolaryngology and urology. The overall association between the size of the NSQIP sample and the Medicare sample was 0.08. CONCLUSION: Although NSQIP has the potential to capture a diverse surgical caseload, some specialties and procedures are undersampled, limiting the ability for NSQIP to generate valid benchmarks. There was little correlation between the sample sizes in NSQIP and a national sample. Increasing sampling of underrepresented procedures and developing weights to scale NSQIP to a national sample would strengthen the program's ability to inform health outcomes research and provide valid comparisons across procedures and specialties.

Tracking Changes in US Organizations' Workplace Health Promotion Initiatives: A Longitudinal Analysis of Performance Against Quality Benchmarks.

PURPOSE: To examine changes in organizations' workplace health promotion (WHP) initiatives over time associated with repeated self-assessment using the Well Workplace Checklist (WWC). DESIGN: Well Workplace Checklist data include a convenience sample of US organizations that selected to assess their performance against quality WHP benchmarks. SETTING: Workplaces. SUBJECTS: In total, 577 US organizations completed the WWC in 2 or more years from 2008 to 2015. MEASURES: The WWC is a 100-item organizational assessment that measures performance against the original set of quality benchmarks that were established by the Wellness Council of America (WELCOA). ANALYSIS: This study examined changes in overall WWC scores as well as 7 separate benchmark scores. Multilevel modeling was used to examine changes in scores associated with repeated assessments, controlling for the year of assessment and organizational characteristics. RESULTS: There were significant increases in overall WWC scores (ß = 2.93, P < .001) associated with the repeated WWC assessments, after controlling for organizational characteristics. All 7 benchmark scores had significant increases associated with reassessment. Compared to other benchmarks, operating plan (ß = 6.18, P < .001) and evaluation (ß = 4.91, P < .001) scores increased more with each reassessment. CONCLUSION: Continued reassessment may represent more commitment to and investment in WHP initiatives which could lead to improved quality. Other factors that may positively influence changes in performance against benchmarks include company size, access to outside resources for WHP, and a history with implementing WHP.

Benchmarking Global Trauma Care: Defining the Unmet Need for Trauma Surgery in Ghana.

BACKGROUND: The Lancet Commission on Global Surgery recommended 5000 operations/100,000 persons annually, but did not define condition-specific guidelines. New Zealand, Lancet Commission on Global Surgery's benchmark country, documented 1158 trauma operations/100,000 persons, providing a benchmark for trauma surgery needs. We sought to determine Ghana's annual trauma operation rate compared with this benchmark. METHODS: Data on all operations performed in Ghana from June 2014 to May 2015 were obtained from representative sample of 48/124 district (first level), 8/11 regional, and 3/5 tertiary hospitals and scaled up for nationwide estimates. Trauma operations were grouped by hospital level and categorized into "essential" (most cost-effective, highest population impact) versus "other" (specialized) as per the World Bank's Disease Control Priorities Project. Ghana's annual trauma operation rate was compared with the New Zealand benchmark to quantify current met needs for trauma surgery. RESULTS: About 232,776 operations were performed in Ghana; 35,797 were for trauma. Annual trauma operation rate was 134/100,000 (95% UI: 98-169), only 12% of the New Zealand benchmark. District hospitals performed 62% of all operations in the country, but performed only 38% of trauma operations. Eighty seven percentage of trauma operations were deemed "essential". Among specialized trauma operations, only open reduction and internal fixations had even modest numbers (3483 operations). Most other specialized trauma operations were rare. CONCLUSIONS: Ghana has a large unmet need for operative trauma care. The low percentage of trauma operations in district hospitals indicates an even greater unmet need in rural areas. Future global surgery benchmarking should consider benchmarks for trauma and other specialties, as well as for different hospital levels.

National Trends in the Adoption of Pharmacy Curriculum Outcomes Assessment for Student Assessment and Remediation.

Objective. To determine and describe the current uses of the Pharmacy Curriculum Outcomes Assessment (PCOA) by US schools and colleges of pharmacy. Methods. Assessment professionals from 135 US schools and colleges of pharmacy were invited to complete a 38-item electronic survey. Survey items were designed to investigate common uses of the PCOA, cut points, and "stakes" assigned to the PCOA, identification of at-risk students, and remediation approaches. Results. The school response rate was 68%. The most common uses of the PCOA included curricular assessment (76%), individual student performance assessment (74%), and cohort performance assessment (71%). The PCOA was most frequently administered to third-year pharmacy (P3) students. The approach for assigning "stakes" to PCOA performance varied among programs depending on the student's professional year in the curriculum. Programs used a variety of approaches to establish the benchmark (or cut point) for PCOA performance. Remediation for at risk students was required by less than 25% of programs. Remediation was most commonly required for P3 students (22%). Conclusion. Survey results indicate wide variability between programs regarding PCOA cut points (benchmarks), stakes, and remediation approaches. In the future, it will be important for pharmacy educators to identify and study best practices for use of PCOA within student assessment and remediation plans.

Template matching for benchmarking hospital performance in the veterans affairs healthcare system.

Comparing hospital performance in a health system is traditionally done with multilevel regression models that adjust for differences in hospitals' patient case-mix. In contrast, "template matching" compares outcomes of similar patients at different hospitals but has been used only in limited patient settings.Our objective was to test a basic template matching approach in the nationwide Veterans Affairs healthcare system (VA), compared with a more standard regression approach.We performed various simulations using observational data from VA electronic health records whereby we randomly assigned patients to "pseudo hospitals," eliminating true hospital level effects. We randomly selected a representative template of 240 patients and matched 240 patients on demographic and physiological factors from each pseudo hospital to the template. We varied hospital performance for different simulations such that some pseudo hospitals negatively impacted patient mortality.Electronic health record data of 460,213 hospitalizations at 111 VA hospitals across the United States in 2015.We assessed 30-day mortality at each pseudo hospital and identified lowest quintile hospitals by template matching and regression. The regression model adjusted for predicted 30-day mortality (as a measure of illness severity).Regression identified the lowest quintile hospitals with 100% accuracy compared with 80.3% to 82.0% for template matching when systematic differences in 30-day mortality existed.The current standard practice of risk-adjusted regression incorporating patient-level illness severity was better able to identify lower-performing hospitals than the simplistic template matching algorithm.

Sex differences in stroke metrics among Southeast Asian countries: Results from the Global Burden of Disease Study 2015.

BACKGROUND: Sex differences in cardiovascular diseases generally disadvantage women, particularly within developing regions. AIMS: This study aims to examine sex-related differences in stroke metrics across Southeast Asia in 2015. Furthermore, relative changes between sexes are compared from 1990 to 2015. METHODS: Data were sourced from the Global Burden of Disease Study. Incidence and mortality from ischemic and hemorrhagic strokes were explored with the following statistics derived: (1) women-to-men incidence/mortality ratio and (2) relative percentage change in rate. RESULTS: Women had lower incidence and mortality from stroke compared to men. Notable findings include higher ischemic stroke incidence for women at 30-34 years in high-income countries (women-to-men ratio: 1.3, 95% CI: 0.1, 16.2 in Brunei and 1.3, 95% CI: 0.5, 3.2 in Singapore) and the largest difference between sexes for ischemic stroke mortality in Vietnam and Myanmar across most ages. Within the last 25 years, greater reductions for ischemic stroke metrics were observed among women compared to men. Nevertheless, women below 40 years in some countries showed an increase in ischemic stroke incidence between 0.5% and 11.4%, whereas in men, a decline from -4.2% to -44.2%. Indonesia reported the largest difference between sexes for ischemic stroke mortality; a reduction for women whereas an increase in men. For hemorrhagic stroke, findings were similar: higher incidence among young women in high-income countries and greater reductions for stroke metrics in women than men over the last 25 years. CONCLUSIONS: Distinct sex-specific differences observed across Southeast Asia should be accounted in future stroke preventive guidelines.

A contemporary medicolegal claims analysis of injuries related to neuraxial anesthesia between 2007 and 2016.

STUDY OBJECTIVE: To provide a contemporary medicolegal analysis of claims brought against anesthesia providers in the United States related to neuraxial blocks for surgery and obstetrics. DESIGN: In this retrospective analysis, we analyzed closed claims data from the Controlled Risk Insurance Company (CRICO) Comparative Benchmarking System (CBS) database between 2007 and 2016. SETTING: Closed claims from inpatient and outpatient settings related to neuraxial anesthesia for surgical procedures and obstetrics. PATIENTS: Forty-five claims were identified for analysis. These patients underwent a variety of surgical procedures, included both children and adults, and with ages ranging from 6 to 82. INTERVENTIONS: Patients receiving neuraxial anesthesia (spinals, epidurals) for surgery or obstetrics. MEASUREMENTS: Data collected includes patient demographics, alleged injury type/severity, surgical specialty, likely contributors to the alleged damaging event, and case outcome. Some of the data were drawn directly from coded variables in the CRICO database, and some were gathered from narrative case summaries. MAIN RESULTS: Settlement payments were made in 20% of claims. Reported adverse outcomes ranged from temporary minor to permanent major injuries. Most closed claims were classified as permanent minor injuries. The greatest number of claims involved residual weakness and radiculopathy resulting from epidurals. The largest contributing factor to these injuries was noted to be "Technical Knowledge/Performance" of the anesthesia provider followed by "Missing or Documentation Error." Over half of the claims arose from obstetric patients (31%) and patients undergoing orthopedic surgery (27%). CONCLUSIONS: Patients with pre-existing radiculopathy or comorbidities may warrant more thorough informed consent about the increased risk of injury. Additionally, prompt follow-up, monitoring, and documentation of post-operative symptoms, such as weakness or radiculopathy, are crucial for improving patient safety and satisfaction. More timely communication with the patient and the surgical team regarding residual neurologic symptoms is important for earlier diagnosis of injury.

The Impact of Public Performance Reporting on Market Share, Mortality, and Patient Mix Outcomes Associated With Coronary Artery Bypass Grafts and Percutaneous Coronary Interventions (2000-2016): A Systematic Review and Meta-Analysis.

OBJECTIVE: Public performance reporting (PPR) of coronary artery bypass graft (CABG) and percutaneous coronary intervention (PCI) outcomes aim to improve the quality of care in hospitals, surgeons and to inform consumer choice. Past CABG and PCI studies have showed mixed effects of PPR on quality and selection. The aim of this study was to undertake a systematic review and meta-analysis of the impact of PPR on market share, mortality, and patient mix outcomes associated with CABG and PCI. METHODS: Six online databases and 8 previous reviews were searched for the period 2000-2016. Data extraction, quality assessment, systematic critical synthesis, and meta-analysis (where possible) were carried out on included studies. RESULTS: In total, 22 relevant articles covering mortality (n=19), patient mix (n=14), and market share (n=6) outcomes were identified. Meta-analyses showed that PPR led to a near but not significant reduction in short-term mortality for both CABG and PCI. PPR on CABG showed a positive effect on market share for hospitals (3 of 6 studies) and low-performing surgeons (2 of 2 studies). Five of 6 PCI studies found that high-risk patients were less likely to be treated in States with PPR. CONCLUSIONS: There is some evidence that PPR reduces mortality rates in CABG/PCI-treated patients. The significance of there being no strong evidence, in the period 2000-2016, should be considered. There is need for both further development of PPR practice and further research into the intended and unintended consequences of PPR.

Sociodemographic differences in linkage error: an examination of four large-scale datasets.

BACKGROUND: Record linkage is an important tool for epidemiologists and health planners. Record linkage studies will generally contain some level of residual record linkage error, where individual records are either incorrectly marked as belonging to the same individual, or incorrectly marked as belonging to separate individuals. A key question is whether errors in linkage quality are distributed evenly throughout the population, or whether certain subgroups will exhibit higher rates of error. Previous investigations of this issue have typically compared linked and un-linked records, which can conflate bias caused by record linkage error, with bias caused by missing records (data capture errors). METHODS: Four large administrative datasets were individually de-duplicated, with results compared to an available 'gold-standard' benchmark, allowing us to avoid methodological issues with comparing linked and un-linked records. Results were compared by gender, age, geographic remoteness (major cities, regional or remote) and socioeconomic status. RESULTS: Results varied between datasets, and by sociodemographic characteristic. The most consistent findings were worse linkage quality for younger individuals (seen in all four datasets) and worse linkage quality for those living in remote areas (seen in three of four datasets). The linkage quality within sociodemographic categories varied between datasets, with the associations with linkage error reversed across different datasets due to quirks of the specific data collection mechanisms and data sharing practices. CONCLUSIONS: These results suggest caution should be taken both when linking younger individuals and those in remote areas, and when analysing linked data from these subgroups. Further research is required to determine the ramifications of worse linkage quality in these subpopulations on research outcomes.