Feasibility outcome evaluation

摘要: MethodsStudy designThe original stepped-wedge study design is shown in Figure 5. Clusters were sites (call centres). The original study design included five sequences (A, B, C, D and E) of at least two clusters each. One of the sequences (A) contained three clusters because there were 11 sites in total. Each ‘step’in the stepped-wedge design consisted of 3 months, with a total of five periods (ie data collection time points). The participants assessed in different periods were expected to be mostly the same people (although we did not prevent new individuals being recruited and assessed at the different time points). For this reason, this stepped-wedge study has an ‘open cohort’design.