David Andrew Crawford

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BACKGROUND Active commuting to school may be an important opportunity for children to accumulate adequate physical activity for improved cardiovascular risk factors, enhanced bone health, and psychosocial well-being. The purpose of this study was to examine personal, family, social, and environmental correlates of active commuting to school among children.(More)
BACKGROUND This study examined associations between perceptions of the local neighborhood and walking and cycling among children. METHODS Children aged 5-6 years (n=291) and 10-12 years (n=919) were recruited from 19 Australian primary schools. Parents reported their child's usual walking or cycling to local destinations and their perceptions of their(More)
BACKGROUND Several reviews have summarized the research on correlates of older children's and adolescents' physical activity behaviors, but none have been published on preschool children. Over the past 27 years, a number of studies have investigated the correlates of preschool children's physical activity behaviors. It is timely and necessary to review the(More)
OBJECTIVE This study aimed to determine whether time spent outdoors was associated with objectively measured physical activity, body mass index (BMI) z-score and overweight in elementary-school aged children, cross-sectionally and prospectively over 3 years. METHODS Three-year cohort study with data collected during 2001 and 2004. Nineteen randomly(More)
OBJECTIVES This study investigated the correspondence between measures of physical activity facilities obtained through self-report and objective audits; and identified the socio-demographic, cognitive and behavioral characteristics of those who perceive their physical activity environment to be less supportive than objective measures indicate. METHODS(More)
In developed countries, obesity is inversely associated with socioeconomic status (SES) among women, and less consistently among men; whereas, in developing countries, the association is direct. However, the relationship of SES to weight change over time is unknown. This relationship was the focus of the present literature review. It was hypothesized that,(More)
This study aimed to develop a reliable, valid, and feasible method for assessing physical activity among children ages 5–6 and 10–12 years. Test–retest reliability of a parental proxy questionnaire and a children’s self-report questionnaire was assessed in 280 children and parents. The criterion validity of the questionnaires was assessed using(More)
PURPOSE To examine how perceptions of the local neighborhood relate to adolescents' walking and cycling. DESIGN Exploratory cross-sectional study. SETTING Birth cohort from the Nepean Hospital, Sydney, Australia. SUBJECTS Three hundred forty-seven adolescents (79.1% response rate; 49.6% boys; mean age = 13.0 +/- 0.2 years) and their parents. (More)
The associations of physical activity and sedentary behavior with barriers, enjoyment, and preferences were examined in a population-based mail survey of 1,332 adults. Respondents reporting high enjoyment and preference for physical activity were more likely to report high levels of activity. Those reporting cost, the weather, and personal barriers to(More)
OBJECTIVE To determine the independent contributions of family and neighbourhood environments to changes in youth physical activity and body mass index (BMI) z-score over 5 years. METHODS In 2001, 2004 and 2006, 301 children (10-12 years at baseline) had their height and weight measured (BMI was converted to z-scores using Centers for Disease Control and(More)