Sample size (or number of clusters) by treatment arms
The research team enlisted 2520 households across 10 camps (2E, 2W, 3, 4, 5, 7, 10, 17, 18, 19), with each camp apportioned into 4 to 7 blocks, and 14 to 42 sub-blocks, with the latter as our unit of randomization. Our sample households spanned 280 sub-blocks, with each sub-block randomly assigned to one of the three experimental arms (80 blocks each) and a control group (40 blocks). We selected nine households per sub-block. These households were recruited first through a random walk, in which the field team began near the center of a given sub-block, moved in a randomly selected direction, and proceeded to knock on doors and inquire about interest in participating in our study. Each household we selected was randomized into having the husband or the wife receive the respective intervention.