Table 1. Effect of treatment A and B on the prevalence of Schistosoma haematobium infection among school children compared with treatment C at 2 weeks after praziquantel treatment.

Treatment groups	Baseline, % (No.)	Post-treatment, % (No.)	RR	95% CI	P value
C	15.60 (80/513)	5.82 (26/447)	Reference
A	14.80 (47/318)	4.85 (11/227)	0.83	0.46–1.48	0.52
B	15.80 (72/455)	5.15 (10/194)	0.69	0.43–1.10	0.12

RR = relative risk, CI = confidence interval.