2.4.6. Data analysis
SPSS for Window version 20.0 was used to undertake the data analysis. Independent t-test was conducted for measuring the mean difference of the average changes in PA levels between the control and intervention groups. PA level changes among both the intervention and control groups were calculated through subtracting the baseline PA level scores from those at the 6-month follow-up. Intention to treat analysis (ITT) was adopted, including multiple imputation and last observation carried forward. Independent t-test and chi-squared test were applied as a means of comparing the demographic profiles of the intervention and the control group at the baseline, as well as responders with non-responders at the 6-month follow-up point.