Statistical analysis
SECONDARY
All analyses are conducted according to the intention-to-treat principle. Both descriptive and analytical statistics will be used to compare differences between the two study groups. In order to determine the comparability of the two study groups, the distribution of the socio-demographic and health-related variables will be described. Frequencies, means and standard deviations will be calculated according to the scale level. For non-normally distributed data, medians and interquartile ranges will be presented. For the primary and secondary outcomes, absolute and relative frequencies and their 95% confidence intervals will be reported for both study groups. Fisher’s exact test will be applied to test for statistical significance between the intervention and control group. The results will be regarded as significant if the p-value is less than 0.05 (two-sided). Exploratory subgroup analyses will be performed in order to describe differences stratified by gender, age, GP practices and other possible confounders.The qualitative interview data will be analysed according to the Kuckartz method of qualitative analysis [