Data processing and analysis
generalised
Data were entered into Epi Info version 7.2 software and exported to SPSS version 23 for analysis. Descriptive summaries, such as frequency and proportion, are presented. The group (intervention vs. control) difference was investigated using the chi-squared test for categorical variables. Pre- and post-intervention differences in difference between the intervention and control groups were measured. The generalised estimating equation (GEE) with a binary logit function was used to compare differences in outcome change between the intervention and control groups. The GEE accommodates clustered data and the correlation of observations within subjects. During model fitting, the unstructured covariance matrix was considered, and the effects of possible confounding socio-demographic variables, time, treatment, and time-treatment interactions were analysed. The impact of the intervention was evaluated using time and treatment interaction. Odds ratios and 95% confidence intervals were computed. A 