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BACKGROUND A growing body of research suggests that the suburbanization of food retailers in North America and the United Kingdom in recent decades has contributed to the emergence of urban 'food deserts', or disadvantaged areas of cities with relatively poor access to healthy and affordable food. This paper explores the evolution of food deserts in a(More)
OBJECTIVES Inflicted traumatic brain injury associated with Shaken Baby Syndrome (SBS) is a leading cause of injury mortality and morbidity in infants. A triple-dose SBS prevention program was implemented with the aim to reduce the incidence of SBS. The objectives of this study were to describe the epidemiology of SBS, the triple-dose prevention program,(More)
OBJECTIVES This study examines environmental factors associated with BMI (body mass index) levels among adolescents with the aim of identifying potential interventions for reducing childhood obesity. METHODS Students (n=1,048) aged 10-14 years at 28 schools in London, ON, completed a survey providing information on age, sex, height, weight, home address,(More)
BACKGROUND There are few data on possible age and sex differences in presentation of symptoms for patients with acute coronary disease. OBJECTIVE To investigate demographic differences in presentation of symptoms at the time of hospital presentation for acute myocardial infarction (AMI) and unstable angina. METHODS The medical records of patients who(More)
Although physical activity has been considered as an important modifiable risk factor for obesity, the empirical evidence on the relationship between physical activity and obesity is mixed. Observational studies in the public health literature fail to account for time-invariant unobserved heterogeneity and dynamics of weight, leading to biased estimation of(More)
BACKGROUND "Affective instability" describes affective shifts occurring over hours to days that are associated with clinically significant impairment or distress. Since patients with this condition are clinically "chaotic," we undertook to study affective instability relative to normal affective variability using the tools of chaos theory. METHODS(More)
OBJECTIVES This study reviewed previous studies to explore the effect of season, and consequently weather, on levels of physical activity. STUDY DESIGN AND METHODS Thirty-seven primary studies (published 1980-2006) representing a total of 291883 participants (140482 male and 152085 female) from eight different countries are described, and the effect of(More)
The dexamethasone suppression test (DST) has been widely used in psychiatry as a laboratory aid for the diagnosis of endogenous depression; failure to suppress serum cortisol levels is interpreted as confirming a clinical diagnosis of endogenous depression. We found that serum dexamethasone concentrations in this test vary widely and are determinants of the(More)
BACKGROUND Hip fractures are expensive and a frequent cause of morbidity and mortality in the elderly. In most studies hip fractures have been viewed as a unitary fracture but recently the two main types of fracture (intertrochanteric and subcapital) have been viewed as two fractures with a different etiology and requiring a different approach to(More)
OBJECTIVES We examined whether certain characteristics of the social and physical environment influence a child's mode of travel between home and school. METHODS Students aged 11 to 13 years from 21 schools throughout London, Ontario, answered questions from a travel behavior survey. A geographic information system linked survey responses for 614 students(More)