Table 3.

Summary of S. haematobium infection by study arm from baseline to Year 5 (9–12 years-old cross-section only)

Variable	Groupa						Total
	A1	A2	B1	B2	C1	C2
No. of villages sampled	38	37	37	38	37	38	225
No. tested at baseline	3461	3221	3659	3671	3357	3562	20,931
No. infected at baseline	129	148	898	825	480	834	3314
Prevalence at baseline (%)	3.7	4.6	24.5	22.5	14.3	23.4	15.8
Prevalence of heavy infection at baseline (%)	0.29	0.28	1.86	1.93	0.86	2.50	1.29
No. tested at Year 5	3710	3648	3621	3740	3689	3724	22,132
No. infected at Year 5	22	9	839	503	425	392	2190
Prevalence at Year 5 (%)	0.6	0.2	23.2	13.4	11.5	10.5	9.90
Prevalence of heavy infection at Year 5 (%)	0.13	0.03	1.77	0.64	0.57	0.83	0.66
Absolute difference in prevalence at Year 5 and baseline	−3.1	−4.4	−1.3	−9.1	−2.8	−12.9	−5.90
Relative difference in prevalence at Year 5 and baseline (% change)	−83.8	−95.7	−5.3	−40.4	−19.6	−55.1	−37.3
Village-level arithmetic mean infection intensity at baselineb	0.77	0.52	4.11	5.1	1.78	5.37	2.94
Village-level arithmetic mean infection intensity at Year 5b	0.14	0.05	3.62	1.39	1.37	2.18	1.46
Egg reduction rate (1-Year 5 intensity/baseline)	0.82	0.9	0.12	0.73	0.23	0.59	0.57
Individual-level arithmetic mean infection intensity at baselinec	0.84	0.58	4.05	4.91	1.85	5.64	2.98
Individual-level arithmetic mean infection intensity at Year 5c	0.14	0.05	3.61	1.38	1.37	2.2	1.46

^aStudy arms: Low prevalence areas receiving SBT once a year (A1), and twice a year (A2); high prevalence areas receiving SBT once a year (B1), and twice a year (B2); and high prevalence areas receiving CWT once a year (C1), and twice a year (C2)

^bVillage-level intensity: This is the mean egg count for all tested 9–12 year-old subjects (including those with zero egg counts), which is a measure of community level contamination potential

^cIndividual-level intensity: This is the mean egg count among egg-positive 9–12 year-old subjects, which is an estimate of the intensity of infection among known active cases