Study design and random assignment
This study used a clustered randomized controlled trial to assess impacts, with random assignment at the subdistrict level. The random assignment procedure involved three stages: (1) randomly selecting 225 of the 234 eligible subdistricts for random assignment, (2) randomly assigning these subdistricts into 130 treatment and 95 control subdistricts and (3) randomly selecting 95 of the treatment subdistricts for inclusion in the study (Figure Study design and sample.