Using Mobile Technology for Family-Based Prevention in Families with Low Incomes: Lessons from a Randomized Controlled Trial of a Childhood Obesity Prevention Program.

Researchers are increasingly using web-based technologies to deliver family-based, prevention programming. Few studies have examined the success of such approaches for families with low incomes. The purpose of this study was to describe the level of in-class and online engagement in a childhood obesity prevention program for parents with low incomes, to examine the demographic correlates of parent engagement, and to examine dosage effects on parental feeding outcomes as a function of online exposure. All participants attended in-class nutrition education classes (Eating Smart · Being Active) as part of the Expanded Food and Nutrition Education Program (EFNEP) in Colorado and Washington State (classes were offered in English and Spanish). Participants in this analysis were 168 parents from a larger cluster randomized controlled trial who had been randomly assigned to also receive a newly developed, mobile-based version of an efficacious, feeding-focused, childhood obesity prevention program. Results showed that despite high levels of in-person attendance (70%), participants only accessed 47% of the videos (online content). Older parents and parents of girls showed higher levels of in-person attendance; currently employed parents showed lower levels. Online engagement varied as a function of ethnicity and acculturation: non-Hispanic parents accessed the most videos, low-acculturated Hispanic parents accessed the second most, and highly acculturated Hispanic parents accessed the least. In contrast, low-acculturated Hispanic parents showed the highest in-person attendance. For all but one outcome, significant online program effects were found only for parents who accessed at least half of the videos. Implications for mobile-based, family-based prevention programs for parents with low incomes are considered.ClinicalTrials.gov Identifier: NCT03170700; Registration Date: March 08, 2017.

Facilitating implementation of primary care mental health over time and across organizational contexts: a qualitative study of role and process.

BACKGROUND: Healthcare organizations have increasingly utilized facilitation to improve implementation of evidence-based practices and programs (e.g., primary care mental health integration). Facilitation is both a role, related to the purpose of facilitation, and a process, i.e., how a facilitator operationalizes the role. Scholars continue to call for a better understanding of this implementation strategy. Although facilitation is described as dynamic, activities are often framed within the context of a staged process. We explored two understudied characteristics of implementation facilitation: 1) how facilitation activities change over time and in response to context, and 2) how facilitators operationalize their role when the purpose of facilitation is both task-focused (i.e., to support implementation) and holistic (i.e., to build capacity for future implementation efforts). METHODS: We conducted individual monthly debriefings over thirty months with facilitators who were supporting PCMHI implementation in two VA networks. We developed a list of facilitation activities based on a literature review and debriefing notes and conducted a content analysis of debriefing notes by coding what activities occurred and their intensity by quarter. We also coded whether facilitators were "doing" these activities for sites or "enabling" sites to perform them. RESULTS: Implementation facilitation activities did not occur according to a defined series of ordered steps but in response to specific organizational contexts through a non-linear and incremental process. Amount and types of activities varied between the networks. Concordant with facilitators' planned role, the focus of some facilitation activities was primarily on doing them for the sites and others on enabling sites to do for themselves; a number of activities did not fit into one category and varied across networks. CONCLUSIONS: Findings indicate that facilitation is a dynamic and fluid process, with facilitation activities, as well as their timing and intensity, occurring in response to specific organizational contexts. Understanding this process can help those planning and applying implementation facilitation to make conscious choices about the facilitation role and the activities that facilitators can use to operationalize this role. Additionally, this work provides the foundation from which future studies can identify potential mechanisms of action through which facilitation activities enhance implementation uptake.

Perceived Changes in Social Connectedness Across the Life Course: A Mixed Method Approach.

Social connection is important across the life course, but overall levels have been declining. The COVID-19 pandemic presented a unique context to examine social connectedness and adaptive capacity in times of social adversity. We used a parallel mixed method design to collect online survey data from a representative U.S. sample (N = 359). Applying an exploratory sequential approach, we used a general linear model multivariate approach to repeated measures to test for differences in participants' perceptions of social connectedness by time and age category and qualitative analysis to gain insights about disrupted social contexts. Results indicated that social connectedness decreased after mitigation restrictions for all age groups, but individuals in emerging and late adulthood felt the greatest impact. Two themes emerged: differing emotional responses to altered communication and intentionality of maintaining and/or creating social connections. Experiences of social connectedness need to be understood as a function of life stage and developmental timing.

Youth Perspectives on the Effects of a Family-centered Media Literacy Intervention to Encourage Healthier Eating.

A pretest-posttest field test with control group (N = 189 parent-child dyads) tested a structural model representing youths' (ages 9-14) perspectives to examine the efficacy of a family-centered, media literacy-oriented intervention promoting fruit and vegetable consumption. The intervention facilitated critical discussion about nutrition and media, mentored by the parent. Results showed that youths' increases in fruit and vegetable consumption flowed from parent-child discussion of nutrition labels, which was predicted by child-initiated discussion, critical thinking about media sources, and critical thinking about media content. Multivariate analyses revealed that the intervention was productive for all participating age groups and for all dependent variables. The results suggest that a developmental progression from critical thinking about source to critical thinking about content affects behavior change and can be catalyzed through media literacy education and encouragement to discuss media messages (i.e. practice) with parents.

Randomized Controlled Trial of a Program to Help Latina Mothers Help Their Children Cope with Stress: Effects on Parenting, Child Coping, and Adjustment.

"Madres Apoyando el Desarrollo Emocional de Sus Hijos" ("Mothers Supporting the Emotional Development of Their Children") is a parenting education program designed to help Latina mothers help their school-age children cope with stress. A previous randomized controlled trial, with a pre-post design, showed that the program had the predicted effects on mothers' knowledge, attitudes, and behavior. However, no data were collected from the children in that initial evaluation. The purpose of the present study was to determine if the program impacted children's coping and adjustment. One hundred twenty-two primarily first-generation Latina mothers from rural Washington State were randomly assigned to the intervention or to a no treatment control. Seven implementations of the program were conducted. Mothers and their 8- to 13-year-old children completed assessments 1 week before the program started, 1 week after its completion, and 3 months later. The results for maternal behavior were largely replicated: at posttest, intervention mothers, compared to controls, reported higher levels of emotion coaching, showed greater self-efficacy for helping their child cope with stress, and were more likely to report positive strategies for scaffolding their child's responses to stressful situations. Several maternal effects (e.g., emotion-coaching and maternal efficacy) continued at 3 months. Children of intervention mothers at posttest used more primary control coping strategies and reported fewer emotional symptoms; analyses of mothers' ratings of child adjustment replicated the posttest child effects for emotional symptoms, showed fewer other psychological problems at posttest, and showed greater child prosocial behavior at 3 months. The results further support the program's efficacy and provide the first evidence of its effects on child coping and adjustment.

Associations between body image, eating behavior, and diet quality.

Background: Weight-neutral interventions that promote adaptive eating behaviors are becoming a growing area of practice. Understanding whether adaptive eating behaviors are associated with improved diet quality is essential. Body image may be an important factor in this relationship given its close connection to eating behaviors. Aim: The purpose of this study was to develop an understanding of the relationships between positive and negative body image, adaptive and maladaptive eating behaviors, and diet quality. Methods: We recruited 288 adults 18 years and older who were living in the US using Prolific Academic. Participants completed an online survey including measures of positive and negative body image, adaptive and maladaptive eating behaviors, and a dietary screener questionnaire (DSQ). We ran a hierarchical linear regression and tested whether body image and diet quality were mediated by eating behavior. Results: Body image and maladaptive eating behaviors were not associated with diet quality. Body-food choice congruence (B-FCC), an adaptive eating behavior, was associated with diet quality. B-FCC mediated the relationship of positive and negative body image to diet quality. Conclusions: Our findings provide additional support for weight-neutral or adaptive eating interventions as a mechanism to promote diet quality. Additional research may benefit from exploring indirect effects of body image on diet intake, the relationship between eating behavior and diet quality using qualitative data, and the comparison of weight-neutral or non-diet interventions with traditional behavior change interventions.

Evaluation of a Program to Help Low-Income, Latina Mothers Help Their Children Cope With Stress.

This paper describes the evaluation of a program that provides low-income Latina mothers with skills to help their children cope with stress. Based on focus groups with mothers and their school-aged children in two locations, we developed a five-week program for helping mothers identify signs of stress in their children, learn effective emotion-coaching skills, and learn how to effectively encourage their children to use coping strategies that match the controllability of the situation. We conducted a randomized controlled trial in an urban (n = 13) and rural (n = 78) location in which we randomly assigned mothers to either an intervention or a no-treatment control condition. We completed eight implementations of the program (2 in the urban sample and 6 in the rural one). To evaluate the program, we collected pre- and post-assessments of mothers' coping knowledge, emotion coaching, strategies for helping their children cope with stress, maternal self-efficacy in helping their children cope, general parenting practices, and general parenting self-efficacy. Observers assessed the fidelity of program delivery. Mothers who received the intervention, in contrast to those in the control condition, showed significant increases in their knowledge of strategies to help their children cope with stress, in reported emotion-coaching skills, and in the reported use of positive strategies for helping their children manage their behavior and emotions in stressful situations (i.e., helping their children relax and calm down, talking with their children about feelings, helping their children problem-solve, encouraging distraction, and helping their children improve their self-esteem). Post intervention, mothers reported increases in their efficacy for helping their children cope with stress. Analyses revealed no significant effects of the program on general parenting or general parenting self-efficacy, but did have the hypothesized effects on maternal knowledge, attitudes, and reported behavior. Subsequent research should examine the degree to which the program has effects over a longer time period and on children's approaches to coping with stress.

The association between physical activity and self-rated health in Atlantic Canadians.

The population of Atlantic Canada is aging rapidly and has among the highest rates of chronic disease in the country. This cross-sectional study drew data from the Atlantic Partnership for Tomorrow's Health (Atlantic PATH) study to investigate the association between physical activity and self-rated health among adults in this population. The results suggest that physical activity is associated with and may help to improve perceived health status of individuals with one or more chronic conditions. The findings support literature suggesting that physical activity can be beneficial for adults as they age with chronic disease.

Reduced Cognitive Assessment Scores Among Individuals With Magnetic Resonance Imaging-Detected Vascular Brain Injury.

Background and Purpose- Little is known about the association between covert vascular brain injury and cognitive impairment in middle-aged populations. We investigated if scores on a cognitive screen were lower in individuals with higher cardiovascular risk, and those with covert vascular brain injury. Methods- Seven thousand five hundred forty-seven adults, aged 35 to 69 years, free of cardiovascular disease underwent a cognitive assessment using the Digital Symbol Substitution test and Montreal Cognitive Assessment, and magnetic resonance imaging (MRI) to detect covert vascular brain injury (high white matter hyperintensities, lacunar, and nonlacunar brain infarctions). Cardiovascular risk factors were quantified using the INTERHEART (A Global Study of Risk Factors for Acute Myocardial Infarction) risk score. Multivariable mixed models tested for independent determinants of reduced cognitive scores. The population attributable risk of risk factors and MRI vascular brain injury on low cognitive scores was calculated. Results- The mean age of participants was 58 (SD, 9) years; 55% were women. Montreal Cognitive Assessment and Digital Symbol Substitution test scores decreased significantly with increasing age (P<0.0001), INTERHEART risk score (P<0.0001), and among individuals with high white matter hyperintensities, nonlacunar brain infarction, and individuals with 3+ silent brain infarctions. Adjusted for age, sex, education, ethnicity covariates, Digital Symbol Substitution test was significantly lowered by 1.0 (95% CI, -1.3 to -0.7) point per 5-point cardiovascular risk score increase, 1.9 (95% CI, -3.2 to -0.6) per high white matter hyperintensities, 3.5 (95% CI, -6.4 to -0.7) per nonlacunar stroke, and 6.8 (95% CI, -11.5 to -2.2) when 3+ silent brain infarctions were present. No postsecondary education accounted for 15% (95% CI, 12-17), moderate and high levels of cardiovascular risk factors accounted for 19% (95% CI, 8-30), and MRI vascular brain injury accounted for 10% (95% CI, -3 to 22) of low test scores. Conclusions- Among a middle-aged community-dwelling population, scores on a cognitive screen were lower in individuals with higher cardiovascular risk factors or MRI vascular brain injury. Much of the population attributable risk of low cognitive scores can be attributed to lower educational attainment, higher cardiovascular risk factors, and MRI vascular brain injury.

The relationship between anthropometric measures and cardiometabolic health in shift work: findings from the Atlantic PATH Cohort Study.

PURPOSE: To evaluate the relationship between anthropometric measures and cardiometabolic health in shift workers compared to non-shift workers. METHODS: A population health study was conducted with 4155 shift workers and 8258 non-shift workers from the Atlantic Partnership for Tomorrow's Health (PATH) cohort. Linear and logistic regression models were used to assess the differences in anthropometric measures (body adiposity) and self-reported cardiometabolic disease outcomes (obesity, diabetes, and cardiovascular disease) between shift workers and non-shift workers. RESULTS: There was a significant increased risk of cardiovascular disease, obesity, and diabetes among shift workers compared to matched controls despite higher levels of physical activity and lower levels of sedentary behaviour. Shift workers were 17% more likely to be obese (95% CI 7-27) and 27% more likely to have diabetes (95% CI 8-51). The strength of this association was demonstrated by also controlling for body mass index and fat mass index. CONCLUSIONS: Shift work is associated with obesity, cardiovascular disease, and diabetes despite higher levels of physical activity and lower levels of sedentary behaviour. The association between shift work and cardiometabolic health was independent of body mass index for cardiovascular disease and diabetes, and independent of fat mass index for diabetes.

After Childhood Cancer: a Qualitative Study of Family Physician, Parent/Guardian, and Survivor Information Needs and Perspectives on Long-Term Follow-up and Survivorship Care Plans.

Despite support for the provision of a survivorship care plan (SCP) to every cancer survivor, there is a lack of understanding of the needs and preferences of key stakeholders. We examined perspectives of a novel personalized SCP for childhood cancer survivors (CCS), their family, and family physicians (FP). We conducted semi-structured telephone interviews with a purposefully selected sample of CCS, parents/guardians, and FPs. Data included responses to stakeholder cancer care information needs, concerns with or gaps in communication, the perceived role of the FP in the long-term management of CCS care, utility of the SCP, preferred format, and suggestions for improvement. A deductive content analysis was conducted. Twenty-four participants including 8 CCS, 10 parents/guardians, and 6 FPs completed an interview. Four main and several sub-categories emerged. Core categories were coded as (1) informative reference, (2) coordination of follow-up, (3) barriers to follow-up care, and (4) suggestions for improvement and future implementation. The majority of participants preferred an electronic- or web-based format. Overall, the SCP was seen as an informative and concise resource. The SCP was thought to be a valuable tool to foster communication and empower CCSs to become more fully engaged in their own cancer-related health care. FPs viewed the SCP as a useful resource to facilitate and guide the long-term management of the CCS. In addition to the treatment summary, a comprehensive follow-up timeline, personalized lifestyle information, and details on how to access additional psychosocial support were highlighted as important components.

Qualitative Comparative Analysis: A Mixed-Method Tool for Complex Implementation Questions.

The translation and scale-up of evidence-based programs require new methods to guide implementation decisions across varying contexts. As programs are translated to real-world settings, variability is introduced. Some program components may have minor roles to play in producing positive outcomes, and some may have major roles, but only if adapted to meet different contextual demands. While some sources of variability are likely to improve program outcomes, we currently lack methods that allow us to determine the critical components or combinations of components that serve as causal pathways to a desired outcome and then to advise practitioners accordingly. In this paper, we introduce a promising tool for this purpose and illustrate its use in a translational research context. Qualitative Comparative Analysis (QCA) is often used to examine causality in situations that have complex, multiply-determined outcomes. The basic premise of QCA is that different sets of causal conditions, or causal pathways, may lead to a single outcome (the principle of equifinality). We applied QCA to a selection of the highest- and lowest-performing programs from a multi-year two-state dissemination of The Strengthening Families Program for Parents and Adolescents 10-14 to determine which components or combinations of components at the implementation, program delivery, and participant levels produced desired participant outcomes. In particular, we examined which components were necessary (i.e., in the absence of these factors, the outcome didnot occur), and which were sufficient (i.e., in the presence of these factors, the outcome always occurred). Results demonstrated that certain conditions were necessary for program success. In addition, given those necessary conditions, there were two sets of conditions sufficient to produce success, regardless of the presence or absence of any of the others. QCA, not previously used in prevention science research, helps to illuminate causal pathways, leading to concrete, evidence-based implementation decisions that facilitate generalization and scale-up.

The Canadian Partnership for Tomorrow Project: a pan-Canadian platform for research on chronic disease prevention.

BACKGROUND: Understanding the complex interaction of risk factors that increase the likelihood of developing common diseases is challenging. The Canadian Partnership for Tomorrow Project (CPTP) is a prospective cohort study created as a population-health research platform for assessing the effect of genetics, behaviour, family health history and environment (among other factors) on chronic diseases. METHODS: Volunteer participants were recruited from the general Canadian population for a confederation of 5 regional cohorts. Participants were enrolled in the study and core information obtained using 2 approaches: attendance at a study assessment centre for all study measures (questionnaire, venous blood sample and physical measurements) or completion of the core questionnaire (online or paper), with later collection of other study measures where possible. Physical measurements included height, weight, percentage body fat and blood pressure. Participants consented to passive follow-up through linkage with administrative health databases and active follow-up through recontact. All participant data across the 5 regional cohorts were harmonized. RESULTS: A total of 307 017 participants aged 30-74 from 8 provinces were recruited. More than half provided a venous blood sample and/or other biological sample, and 33% completed physical measurements. A total of 709 harmonized variables were created; almost 25% are available for all participants and 60% for at least 220 000 participants. INTERPRETATION: Primary recruitment for the CPTP is complete, and data and biosamples are available to Canadian and international researchers through a data-access process. The CPTP will support research into how modifiable risk factors, genetics and the environment interact to affect the development of cancer and other chronic diseases, ultimately contributing evidence to reduce the global burden of chronic disease.

Multimorbidity in Atlantic Canada and association with low levels of physical activity.

Owing to an aging population and medical advances, the anticipated growth and prevalence of multimorbidity has been recognized as a significant challenge and priority in health care settings. Although physical activity has been shown to play a vital role in the primary and secondary prevention of chronic disease, much less is known about the relationship between physical activity and multimorbidity. The objective of the present study was to examine the relationship between physical activity levels and multimorbidity in male and female adults after adjusting for key demographic, geographical, and lifestyle factors. The study drew data from a prospective cohort in Atlantic Canada (2009-2015). The sample included 18,709 participants between the ages of 35-69. Eighteen chronic diseases were identified. Physical activity levels were estimated based on the long form of the International Physical Activity Questionnaire. Using logistic regression analysis, we found that multimorbid individuals were significantly more likely to be physically inactive (OR=1.26; 95% CI 1.10, 1.44) after adjusting for key sociodemographic and lifestyle characteristics. Additional stratified analyses suggest that the magnitude of the effect between multimorbidity and physical activity was stronger for men (OR=1.41; 95% CI 1.12, 1.79) than women (OR=1.18; CI 1.00, 1.39) and those living in rural (OR=1.43; CI 1.10, 1.85) versus urban (OR=1.20; CI 1.02, 141) areas. Given the generally low levels of physical activity across populations and a growing prevalence of multimorbidity, there is a need for a prospective study to explore causal associations between physical activity, multimorbidity, and health outcomes.

Clinical features and management of erythromelalgia: long term follow-up of 46 cases.

OBJECTIVES: To review our clinical experience of this rare condition and describe the clinical features and response to therapy in a cohort of patients with erythromelalgia (EM), a rare condition, characterised by paroxysmal hyperthermia of the extremities with erythema, pain and intense burning. METHODS: A review was made of the electronic and paper medical records of patients with the diagnosis of EM, with a telephone interview to verify and complete clinical information relating treatment and outcome. RESULTS: 46 patients (41 females) were included in this study. Mean age was 57 years and mean duration of symptoms was 16 years. Raynaud's phenomenon was present in 36 patients (80%) and 4 patients (9%) had systemic sclerosis. Smoking (current or previous) was identified as a possible risk factor in 26 cases and exposure to chronic vibration in 3 cases. Overall, the effect on quality of life was mild in 15% of cases, moderate in 30% and severe in 48%. The most common symptoms were burning (96%), heat (93%), pain (87%), and redness (83%). Symptoms affected the lower limbs in 98% of cases, upper limbs in 76%, face in 20% and trunk in 11%. Triggers included heat (85%), exercise (78%) and time of day (76%). Various medications were tried, showing poor effect in most cases. Intravenous iloprost was given to 27 patients, with benefit in 17 patients (63%). CONCLUSIONS: Erythromelalgia is a rare chronic debilitating condition. Exercise, heat and night time are common triggers. Current medical therapies are seldom effective and further research is sorely needed.

Adiposity Measures and Plasma Adipokines in Females with Rheumatoid and Osteoarthritis.

The objective of this study was to examine the relationship between adipokines and adiposity in individuals with rheumatoid and osteoarthritis in the Atlantic PATH cohort. Using a nested case-control analysis, participants in the Atlantic PATH cohort with rheumatoid or osteoarthritis were matched for measures of adiposity with participants without a history of arthritis. Both measured and self-reported data were used to examine disease status, adiposity, and lifestyle factors. Immunoassays were used to measure plasma markers. BMI was positively correlated with percentage body fat, fat mass index (FMI), and a change in BMI from 18 years of age in all 3 groups. There were no statistical differences between levels of plasma adipokines; adiponectin levels were 6.6, 7.9, and 8.2 µg/ml, leptin levels were 10.3, 13.7, and 11.5 ng/ml, and resistin levels were 10.0, 12.1, and 10.8 ng/ml in participants without arthritis, with rheumatoid arthritis, and with osteoarthritis, respectively. Those with higher levels of adiponectin were more likely to have osteoarthritis (but not rheumatoid arthritis). No association was found between arthritis types and leptin or resistin. This study demonstrates differences in measures of adiposity and adipokines in specific types of arthritis and highlights the need for more research targeting specific adipokines during arthritic disease progression.

Using implementation facilitation to foster clinical practice quality and adherence to evidence in challenged settings: a qualitative study.

BACKGROUND: We evaluated a facilitation strategy to help clinical sites likely to experience challenges implement evidence-based Primary Care-Mental Health Integration (PC-MHI) care models within the context of a Department of Veterans Affairs (VA) initiative. This article describes our assessment of whether implementation facilitation (IF) can foster development of high quality PC-MHI programs that adhere to evidence, are sustainable and likely to improve clinical practices and outcomes. METHODS: Utilizing a matched pair design, we conducted a qualitative descriptive evaluation of the IF strategy in sixteen VA primary care clinics. To assess program quality and adherence to evidence, we conducted one-hour structured telephone interviews, at two time points, with clinicians and leaders who knew the most about the clinics' programs. We then created structured summaries of the interviews that VA national PC-MHI experts utilized to rate the programs on four dimensions (overall quality, adherence to evidence, sustainability and level of improvement). RESULTS: At first assessment, seven of eight IF sites and four of eight comparison sites had implemented a PC-MHI program. Our qualitative assessment suggested that experts rated IF sites' programs higher than comparison sites' programs with one exception. At final assessment, all eight IF but only five comparison sites had implemented a PC-MHI program. Again, experts rated IF sites' programs higher than their matched comparison sites with one exception. Over time, all ratings improved in five of seven IF sites and two of three comparison sites. CONCLUSIONS: Implementing complex evidence-based programs, particularly in settings that lack infrastructure, resources and support for such efforts, is challenging. Findings suggest that a blend of external expert and internal regional facilitation strategies that implementation scientists have developed and tested can improve PC-MHI program uptake, quality and adherence to evidence in primary care clinics with these challenges. However, not all sites showed these improvements. To be successful, facilitators likely need at least a moderate level of leaders' support, including provision of basic resources. Additionally, we found that IF and strength of leadership structure may have a synergistic effect on ability to implement higher quality and evidence-based programs.

Relationship between paediatric CT scans and subsequent risk of leukaemia and brain tumours: assessment of the impact of underlying conditions.

BACKGROUND: We previously reported evidence of a dose-response relationship between ionising-radiation exposure from paediatric computed tomography (CT) scans and the risk of leukaemia and brain tumours in a large UK cohort. Underlying unreported conditions could have introduced bias into these findings. METHODS: We collected and reviewed additional clinical information from radiology information systems (RIS) databases, underlying cause of death and pathology reports. We conducted sensitivity analyses excluding participants with cancer-predisposing conditions or previous unreported cancers and compared the dose-response analyses with our original results. RESULTS: We obtained information from the RIS and death certificates for about 40% of the cohort (n∼180 000) and found cancer-predisposing conditions in 4 out of 74 leukaemia/myelodysplastic syndrome (MDS) cases and 13 out of 135 brain tumour cases. As these conditions were unrelated to CT exposure, exclusion of these participants did not alter the dose-response relationships. We found evidence of previous unreported cancers in 2 leukaemia/MDS cases, 7 brain tumour cases and 232 in non-cases. These previous cancers were related to increased number of CTs. Exclusion of these cancers reduced the excess relative risk per mGy by 15% from 0.036 to 0.033 for leukaemia/MDS (P-trend=0.02) and by 30% from 0.023 to 0.016 (P-trend<0.0001) for brain tumours. When we included pathology reports we had additional clinical information for 90% of the cases. Additional exclusions from these reports further reduced the risk estimates, but this sensitivity analysis may have underestimated risks as reports were only available for cases. CONCLUSIONS: Although there was evidence of some bias in our original risk estimates, re-analysis of the cohort with additional clinical data still showed an increased cancer risk after low-dose radiation exposure from CT scans in young patients.

Small-area spatio-temporal analyses of bladder and kidney cancer risk in Nova Scotia, Canada.

BACKGROUND: Bladder and kidney cancers are the ninth and twelfth most common type of cancer worldwide, respectively. Internationally, rates vary ten-fold, with several countries showing rising incidence. This study describes the spatial and spatio-temporal variations in the incidence risk of these diseases for Nova Scotia, a province located in Atlantic Canada, where rates for bladder and kidney cancer exceed those of the national average by about 25% and 35%, respectively. METHODS: Cancer incidence in the 311 Communities of Nova-Scotia was analyzed with a spatial autoregressive model for the case counts of bladder and kidney cancers (3,232 and 2,143 total cases, respectively), accounting for each Community's population and including variables known to influence risk. A spatially-continuous analysis, using a geostatistical Local Expectation-Maximization smoothing algorithm, modeled finer-scale spatial variation in risk for south-western Nova Scotia (1,810 bladder and 957 kidney cases) and Cape Breton (1,101 bladder, 703 kidney). RESULTS: Evidence of spatial variations in the risk of bladder and kidney cancer was demonstrated using both aggregated Community-level mapping and continuous-grid based localized mapping; and these were generally stable over time. The Community-level analysis suggested that much of this heterogeneity was not accounted for by known explanatory variables. There appears to be a north-east to south-west increasing gradient with a number of south-western Communities have risk of bladder or kidney cancer more than 10% above the provincial average. Kidney cancer risk was also elevated in various northeastern communities. Over a 12 year period this exceedance translated in an excess of 200 cases. Patterns of variations in risk obtained from the spatially continuous smoothing analysis generally mirrored those from the Community-level autoregressive model, although these more localized risk estimates resulted in a larger spatial extent for which risk is likely to be elevated. CONCLUSIONS: Modelling the spatio-temporal distribution of disease risk enabled the quantification of risk relative to expected background levels and the identification of high risk areas. It also permitted the determination of the relative stability of the observed patterns over time and in this study, pointed to excess risk potentially driven by exposure to risk factors that act in a sustained manner over time.

Rationale, design, and methods for Canadian alliance for healthy hearts and minds cohort study (CAHHM) - a Pan Canadian cohort study.

BACKGROUND: The Canadian Alliance for Healthy Hearts and Minds (CAHHM) is a pan-Canadian, prospective, multi-ethnic cohort study being conducted in Canada. The overarching objective of the CAHHM is to understand the association of socio-environmental and contextual factors (such as societal structure, activity, nutrition, social and tobacco environments, and access to health services) with cardiovascular risk factors, subclinical vascular disease, and cardiovascular and other chronic disease outcomes. METHODS/DESIGN: Participants between 35 and 69 years of age are being recruited from existing cohorts and a new First Nations Cohort to undergo a detailed assessment of health behaviours (including diet and physical activity), cognitive function, assessment of their local home and workplace environments, and their health services access and utilization. Physical measures including weight, height, waist/hip circumference, body fat percentage, and blood pressure are collected. In addition, eligible participants undergo magnetic resonance imaging (MRI) of the brain, heart, carotid artery and abdomen to detect early subclinical vascular disease and ectopic fat deposition. DISCUSSION: CAHHM is a prospective cohort study designed to investigate the impact of community level factors, individual health behaviours, and access to health services, on cognitive function, subclinical vascular disease, fat distribution, and the development of chronic diseases among adults living in Canada.