Definition of adherence to the intervention and how this is assessed including extent of exposure
HOLIDAYS
Villages did not all run the intervention classes in the same way. There was variability in the number of planned classes per week, the length of these and the size of classes. Also, some children who lived far from classes in their village could not be reached. This was further complicated by COVID-19 when schools were closed and no after-school classes were running. This makes calculation of measures of adherence challenging. For simplicity we will simply use counts of the numbers of classes i) offered to and ii) attended by each child. We also assume that, had the intervention run as planned, then each child would have been offered 360 classes (6 classes a week for 60 weeks, this corresponding approximately to a 17-month period with allowance for holidays etc.). We refer to this as the ideal number of classes.For the At child level we will define adherence in three ways.Attended as a proportion of ideal (Offered as a proportion of ideal Attended as a proportion of offered (At village level, using Attended as a proportion of ideal Offered as a proportion of ideal Attended as a proportion of offered Each measure will be summarised using means and standard deviations, and in a contingency table with adherence bands of (0, > 0 to 25%, > 25% to 50%, > 50% to 75%, > 75% to 100%, Table Adherence, intervention arm only