Statistical analysis and model selection
Individuals with missing data for certain analyses were excluded so the totals varied slightly according to the information available. Analysis for the association between injury outcome and determinants was undertaken with Stata software using multivariate logistic regression, reporting odd ratios (OR) and P-values based on two-tailed tests. For initial logistic regression modelling, overall injury was used as an outcome (‘0’ if no injury in the past 12 months, ‘1’ if reporting at least one injury that was serious enough to interfere with daily activities and/or required medical attention).