Sample size (or number of clusters) by treatment arms
Our experimental sample consists of the 34,422 MoE employees who appear at least once
on official government payroll records between March 2017 and February 2020, ostensibly
because they worked in one of 1,530 schools in Kandahar, Nangarhar, and Parwan provinces
(spanning a total of 42 districts). These schools were divided into 401 experimental reg-
istration zones using information on schools’ location, number of employees, and security.