Work to expand ICAD has increased the number of studies with longitudinal accelerometer data, and expanded the breadth of behavioural, social and environmental characteristics that can be used as exposure variables. Extensive documentation, describing the source data and harmonisation procedure, was prepared and made available through the ICAD website. Harmonised variables were derived iteratively, with input from the ICAD investigators and a panel of invited experts. All data were collated into a single repository for cataloguing and harmonisation. Methodįollowing a consultation process, ICAD partners were requested to share accelerometer data and information on selected behavioural, social, environmental and health-related constructs. In this paper, we describe the acquisition, management and harmonisation of non-accelerometer data in a project to expand the International Children’s Accelerometry Database (ICAD). Where this approach is used, transparency of the methodology for data collation and harmonisation is essential to enable appropriate analysis and interpretation of the derived data. One route to achieving this is through the pooling and co-analysis of data from multiple studies. Large, heterogeneous datasets are required to enhance understanding of the multi-level influences on children’s physical activity and sedentary behaviour.
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