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OBJECTIVE To examine whether the association of inadequate or unclear allocation concealment and lack of blinding with biased estimates of intervention effects varies with the nature of the intervention or outcome. DESIGN Combined analysis of data from three meta-epidemiological studies based on collections of meta-analyses. DATA SOURCES 146(More)
BACKGROUND Greater time spent screen-viewing (SV) has been linked to adverse health outcomes. The aim of this study was to examine whether parental SV time is associated with child SV time on week and weekend days. METHODS Cross-sectional survey of 1078 children aged 5-6 and at least 1 parent. Child and parent SV was reported for weekday and weekend days.(More)
BACKGROUND A number of studies have suggested that there is a need to increase the physical activity levels of children. Parents are important influences on children's behaviour. There is a lack of information about whether there are associations between the physical activity levels of young children and their parents. The current study examined the(More)
Collections of meta-analyses assembled in meta-epidemiological studies are used to study associations of trial characteristics with intervention effect estimates. However, methods and findings are not consistent across studies. To combine data from 10 meta-epidemiological studies into a single database, and derive a harmonized dataset without overlap(More)
BACKGROUND Extracurricular programmes could provide a mechanism to increase the physical activity (PA) of primary-school-aged children. The aim of this feasibility study was to examine whether the Action 3:30 intervention, which is delivered by teaching assistants, holds promise as a means of increasing the PA of Year 5 and 6 children. METHODS A cluster(More)
OBJECTIVE To compare the key differences between school lunches and packed lunches as consumed in a nationally representative sample of primary schools, 6-8 months after the nutrient-based standards for school lunch became mandatory. DESIGN Data on 6580 pupils' school lunches and 3422 pupils' packed lunches were collected between February and April 2009(More)
BACKGROUND Children's screen viewing (SV) is associated with higher levels of childhood obesity. Many children exceed the American Academy of Pediatrics guideline of 2 hours of television (TV) per day. There is limited information about how parenting styles and parental self-efficacy to limit child screen time are associated with children's SV. This study(More)
for their help in conducting participant observation and interviews and in analyzing our findings. Members of the Russell Sage Foundation Social Impacts of 9/11 Working Group and the Columbia Sociology Colloquium offered valuable suggestions when Polletta presented our work there. Staffers and volunteers with Imagine New York and Listening to the City(More)
BACKGROUND Many children do not engage in recommended levels of physical activity (PA), highlighting the need to find ways to increase children's PA. Process evaluations play an important role in improving the science of randomised controlled trials. We recently reported the results of the Action 3:30 cluster randomised feasibility trial illustrating higher(More)
H ow do people fi ght corporate globalization? When the target is a global system, to whom do activists direct their anger and their claims? While the most visible sites of anti-globalization protest have been the summits of the World Trade Organization, the International Monetary Fund and the World Bank, these events are only the tip of the iceberg. On '(More)