6.2. Analysis.

Comparison 6: Attrition, Outcome 2: Not in meta‐analysis

Not in meta‐analysis
Study	Outcome	Outcome data
Insufficient data
Casey 1960	Attrition	Unclear number of randomised participants between groups
Kurland 1961	Attrition	Unclear number of randomised participants between groups: Indication of larger dropout for active placebo compared to standard placebo. Number of subjects at each evaluation point: Active placebo: 37 referred, 29 initially, 23 after 2 weeks, 8 after 4 weeks, 2 after 6 weeks Standard placebo: 37 referred, 30 initially, 29 after 2 weeks, 16 after 4 weeks, 9 after 6 weeks
Lipman 1966	Attrition	Unclear number of randomised participants between groups
Parkes 2015	Attrition	Unclear number of randomised participants between groups. However, for the 80 out of 81 randomised participants accounted for, attrition was 0/40 participants in each placebo group for the primary evaluation time point.
Rief 2012	Attrition	Unclear number of randomised participants between groups
Shader 1964	Attrition	Unclear number of participants for whom an outcome was measured