Heather Bryant

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BACKGROUND Cancer survival is a key measure of the effectiveness of health-care systems. Persistent regional and international differences in survival represent many avoidable deaths. Differences in survival have prompted or guided cancer control strategies. This is the first study in a programme to investigate international survival disparities, with the(More)
OBJECTIVE To develop and test the intra-rater reliability of an interview-administered questionnaire that assesses lifetime patterns of total physical activity including occupational, household, and exercise/sports activities. METHODS The questionnaire was developed and pretested using cognitive interviewing techniques on a sample of women with and(More)
The effect of cigarette smoking on recurrence (defined in this study as the need for repeat surgery) in patients who had previously required surgery for Crohn's disease was assessed in a historical cohort of 174 patients. Mean follow-up was 10.8 yr. The 5- and 10-yr recurrence rates were 28% and 56%, respectively. Five- and 10-yr rates were significantly(More)
Whereas mammographic density and adiposity are positively associated with postmenopausal breast cancer risk, they are inversely associated with one another. To examine the association between these two risk factors, a secondary analysis of data from a randomized controlled trial of a year-long aerobic exercise intervention was done. Participants were 302(More)
Recently, human papillomavirus (HPV) infection has been causally associated with a subset of head and neck cancers, particularly oropharyngeal cancer. As national cancer reporting systems typically report incidence rates of oropharyngeal cancer grouped with other cancers of the head and neck region, the objective of this study was to present(More)
BACKGROUND AND OBJECTIVE Despite assumed similarities in Canadian and US dietary habits, some differences in food availability and nutrient fortification exist. Food-frequency questionnaires designed for the USA may therefore not provide the most accurate estimates of dietary intake in Canadian populations. Hence, we undertook to evaluate and modify the(More)
Survival estimates measured from the time cancer diagnosis become less informative after one or two years' survival. Using records from the Canadian Cancer Registry linked to the Canadian Vital Statistics Death Database, five-year conditional relative survival ratio (RSR) estimates were derived for a large number of cancers. For each cancer with an initial(More)
CONTEXT No population-based data are available on the use of complementary and alternative medicine (CAM) specifically among colorectal cancer patients. OBJECTIVE To examine the prevalence and determinants of CAM use among colorectal cancer patients in Alberta, Canada. DESIGN Population-based questionnaire. SETTING AND PARTICIPANTS Patients (871 of(More)
BACKGROUND As part of a nested case-control study of benign proliferative breast disease (BPBD) conducted within the cohort of women participating in the Alberta breast screening programme, an analysis of all women who had a benign breast biopsy between 1990 and 1995 was undertaken to identify the epidemiological risk factors for BPBD. METHODS The breast(More)
We conducted a population-based case-control study of 1,237 incident breast cancer cases and 1,241 controls in Alberta between 1995 and 1997 to examine the effect of physical activity performed at different ages and life periods on breast cancer risk. In this study, we measured all types of physical activity done throughout life with a questionnaire(More)