Table 4.

The relative percentages of heavy and light intensities of S. haematobium infected children of sentinel primary schools at Al Jabalain and El Salam districts at baseline and 8 months of follow-up

District	Variable	Baseline survey			Follow-up survey			Reduction rate (%)	95% CI	P-value
		Total no.	Light infection (%)	Heavy infection (%)	Total no.	Light infection (%)	Heavy infection (%)
Al Jabalain	Unit
	Al Jabalain	291	18.6	8.9	312	4.8	0.6	92.8	0.06–0.30	<0.001
	Assalaya	250	8.8	2.4	300	2.0	0.3	86.1	0.08–0.89	0.03
	Jazeera Aba	129	0.9	0.9	148	0	0	100
	Joda	300	0.7	0.3	305	0.3	0	100
	Kenana	451	3.1	0.9	300	0.7	0	100
	Rabak	211	3.4	4.3	307	1.0	0	100
	Subtotal	1,632	6.2	2.9	1,672	1.6	0.2	93.9	0.06–0.22	<0.001
El Salam	Unit
	Al Rawat	188	20.7	23.4	301	7.3	1.0	95.7	0.05–0.17	<0.001
	Al Zelit	291	26.5	18.6	315	1.6	0	100
	Al Naeem	312	21.2	12.5	300	6.3	4.0	68	0.31–0.69	<0.001
	Al Kewaik	150	18.0	4.0	304	0.7	0	100
	Al Migainis	211	14.7	10.9	305	6.9	0	100
	Subtotal	1,152	20.8	14.4	1,525	4.5	1.0	93.2	0.10–0.18	<0.001
Total	Gender
	Boys	2,127	12.1	7.9	2,328	3.0	0.7	90.6	0.13–0.23	<0.001
	Girls	657	12.6	7.3	869	2.9	0.1	98.4	0.02–0.08	<0.001
	Age group
	≤9-year-old	1,032	10.8	7.4	1,157	2.2	0.3	96.5	0.04–0.12	<0.001
	10~12-year-old	1,048	13.0	7.8	1,313	3.5	0.8	89.3	0.14–0.29	<0.001
	≥13-year-old	704	13.2	8.0	727	3.4	0.6	93.1	0.07–0.23	<0.001
Total		2,748	12.2	7.7	3,197	3.0	0.6	92.7	0.11–0.18	<0.001

^*Light infection intensity (<50 EP10) and heavy infection intensity (×50 EP10) of S. haematobium infections.

Reduction rate=(% of heavy infection intensity at baseline survey-% of heavy infection intensity at follow-up survey)/% of heavy infection intensity at baseline survey×100.