Data processing .do files were adapted from .do files provided to the project team by Ted Miguel. Numbered .do files and .log files were shared with Ted Miguel and colleagues on the 18th of September 2014, and are unchanged. The .do file ‘Sensitivity.do’ was added at a later date following comments from Ted Miguel and his team that alerted us to the time-frames that were analysed in their original paper. The folders ‘data’ and ‘tables’ are empty working folders. Data associated with the study available on request by contacting Ted Miguel and his team. All analyses were conducted in STATA 13.