Table 1.

Characteristics of Msambweni urinary schistosomiasis control study population 1984–1992, according to baseline infection status^*

Characteristics	Uninfected at baseline (n = 2,506)		Infected at baseline (n = 2,334)		χ2 (df)	P
	n	%	n	%
Age, years
5–11	945	37.7	1,063	45.5	30.6 (1)	< 0.001
12–20	1,561	62.3	1,271	54.5
Sex
Male	1,323	52.8	1,150	49.3	6.0 (1)	0.01
Female	1,183	47.2	1,184	50.7
Village
Vingujini	671	26.8	353	15.1	185.9 (8)	< 0.0001
Bomani	579	23.1	575	24.6
Mwaembe	351	14.0	223	9.6
Sawa Sawa	259	10.3	257	11.0
Marigiza	45	1.8	71	3.0
Vindungeni	67	2.7	84	3.6
Kisimachande	263	10.5	306	13.1
Nganja	80	3.2	164	7.0
Mililani	191	7.6	301	12.9
School
Msambweni Secondary	211	8.4	122	5.2	224.0 (8)	< 0.0001
Msambweni Primary	391	15.6	531	22.8
Vingujini Primary	421	16.8	319	13.7
Jomo Kenyatta	485	19.4	643	27.5
Milalani Primary	115	4.6	384	16.5
Nursery School 6	57	2.3	33	1.4
Nursery School 7	29	1.2	12	0.5
Nursery School 8	87	3.5	60	2.6
Not in school	18	0.7	12	0.5
Treatment
None	1,051	41.9	0	0.0	3,038.3 (4)	< 0.0001
Praziquantel	5	0.2	1,023	43.8
Three doses of metrifonate	2	0.1	752	32.2
One or two doses of metrifonate	12	0.5	226	9.7
Missed, placebo, unknown	21	0.8	106	4.5
Hematuria
None	1,549	61.8	496	21.3	1,833.5 (5)	< 0.0001
Trace	24	1.0	106	4.5
1+	80	3.2	571	24.5
2+	29	1.2	390	16.7
3+	18	0.7	644	27.6

^*Column percentages were calculated for each sub-group category within the separate characteristics listed. df = degrees of freedom.