Study participants
SECONDARY
Adolescent girls and boys aged 10-17 years attending secondary schools were included in the study. We included public schools that have secondary students (form 1 (youngest) – form 4 (oldest)), and for which we had permission from school administrators. We randomized and enrolled 42 schools which were first matched on key characteristics (school rankings, number of students, and distance to main road), using coarsened exact matching (Sample sizes were not calculated for the present baseline analyses, only for the main study, as described previously [