Statistical Analysis
Sample size calculations were based on the ability to detect a 10% change in minutes spent on leisure-time physical activity and a 5% change in weight. A sample size of 62 participants per group was predicted to have a power of 80% to detect these changes at a 5% significance level. Accounting for a possible but unlikely 20% attrition rate brought the number to 75 per group. The data was assessed for normality to ensure that the assumptions that informed the analyses were met. 