Table 1. Sample size calculations for the components of the impact assessment.

	Huambo	Uige	Zaire	Total
Overall no. schools	1,023	1,278	288	2,589
Schistosomiasis survey
No. schools	220	270	112	602
Planned sample size	6,600	8,100	3,360	18,060
No. students inviteda	8,360	10,260	4,256	22,876
STH survey
No. schools	95	48	81	224
Planned sample size	2,850	1,440	2,430	6,720
No. students invitedb	3,895	1,968	3,321	9,184
School WASH survey
No. schools	220	270	112	602

^aTo account for a 25% non-consent or urine specimen non-return rate. ^bTo account for a 35% non-consent or stool specimen non-return rate. RDT = rapid diagnostic test. STH = soil-transmitted helminth. WASH = water, sanitation, and hygiene.