Hand hygiene intervention to optimise soil-transmitted helminth infection control among primary school children: the Mikono Safi cluster randomised controlled trial in northwestern Tanzania

Table 1 Characteristics of clusters randomised to the intervention or control arm of the Mikono Safi trial, Kagera region, Tanzania

	Intervention	Control	Total
Number of participating clusters (schools)	8	8	16
Total number of children enrolled in participating schools	4872	4607	9479
Mean number of children per school	609	576	592
Number of schools located in:
Bukoba Municipality^a	4	4	8
Bukoba rural	2	3	5
Muleba	2	1	3
Source of school water supply
Number of school supplied with piped water	5	3	8
Number of schools using rain water	3	5	8

^aOne-half of the schools in the trial and in each arm were located in the urban municipality and the remaining half in rural area

ISSN: 1741-7015