Nicholas J. Birkett

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OBJECTIVES To predict exercise stage transitions over two consecutive 6-month periods using the theory of planned behaviour (TPB). It was hypothesized that different social cognitive constructs would predict different stage transitions. DESIGN Prospective and longitudinal in order to predict multiple stage transitions over time. Assessments were made at(More)
INTRODUCTION The purpose of this study was to identify key demographic and health factors associated with physical activity (PA) participation in adults with type 1 or type 2 diabetes. METHODS Participants were adults > or = 18 yr of age living in the province of Alberta, Canada who were previously diagnosed with type 1 (N = 697) or type 2 (N = 1614)(More)
Adaptive allocation has been proposed as a procedure to reduce the risk of chance imbalance of important prognostic factors in randomized controlled trials when the number of prognostic factors is large. In this article, minimization, a type of adaptive allocation, is compared to simple randomization and stratified allocation in a series of Monte Carlo(More)
Amitriptyline (AT) relieves some patients with postherpetic neuralgia (PHN). Many patients suffer side effects and better therapies are necessary. The aim of this study was to evaluate the efficacy of maprotiline (MT) (noradrenergic) compared to AT (mixed noradrenergic and serotonergic) in this disorder. Thirty-five patients entered a randomized,(More)
Although testicular cancer is a relatively rare lesion, accounting for only 1.1% of all malignant neoplasms in males in Canada, it is the most common cancer among Canadian men 20-45 years of age. Knowledge of the causes of testicular cancer risk in general, and more specifically, its association with diet, remain limited. Data from 601 cases of testicular(More)
BACKGROUND The purpose of this study was to test the ability of the Transtheoretical Model (TTM) to predict exercise stage transition of individuals in a large, untreated-population-based, random sample of Canadian adults (18-65 years of age) over two consecutive time periods. METHODS Assessments of TTM's stage of exercise behavior change, self-efficacy,(More)
Physical activity plays a key role in diabetes management, and in reducing the risk factors related to the development of co-morbid conditions. This study examined predictors of physical activity (Static Model) and activity change (Change Model) for individuals with type 1 (T1D) or type 2 diabetes (T2D) in a population sample of 1662 adults (510 type 1;(More)
BACKGROUND The number of women who delay childbirth to their late 30s and beyond has increased significantly over the past several decades. Studies regarding the relation between older maternal age and the risk of stillbirth have yielded inconsistent conclusions. In this systematic review we explored whether older maternal age is associated with an(More)
Two hundred and eight patients with post-herpetic neuralgia (PHN) were assessed in a prospective, longitudinal study designed to evaluate demography, clinical features, treatment results and long-term status. PHN affected both sexes equally increasing in frequency and severity with age. There was a predilection for involvement of the ophthalmic division of(More)