Table 1.

Prevalence of periportal fibrosis (PPF) and Schistosoma mansoni infection intensity and prevalence by age, sex, and village in Mara region, north-eastern Lake Victoria, and Tanzania

	Periportal fibrosis (PPF)				S. mansoni infection status
					Infection prevalence				Intensity of infection (geometrical mean no. of eggs per gram of feces; EPG)
	No. of exam	Total no. (%)	M	F	No. exam	Total	M	F	All	M	F
Age group (year)
15–24	47	3 (6.4)	2 (7.7)	1 (4.8)	120	75 (62.5)	45 (65.2)	30 (58.8)	202.1	177.9	234.8
25–34	108	24 (22.2)	17 (25.8)	7 (16.7)	98	54 (55.1)	31 (55.2)	23 (54.8)	92.8	116.4	61.4
35–44	78	24 (30.8)	21 (51.2)	3 (8.1)	69	36 (52.2)	13 (41.9)	23 (60.5)	96.2	55.0	129.8
45–54	53	14 (26.4)	12 (41.7)	4 (13.8)	61	32 (52.5)	17 (58.6)	15 (46.9)	154.0	242.5	73.9
55–64	45	9 (20.0)	6 (26.1)	3 (13.6)	26	14 (53.9)	9 (60.0)	5 (45.6)	120.9	153.6	76.4
65+	44	10 (22.7)	10 (35.7)	0 (0.0)	38	21 (55.3)	16 (66.7)	5 (35.7)	129.5	193.0	20.6
Total	375	84 (22.4)	66 (31.7)	18 (10.8)	412	232 (56.3)	131 (58.5)	101 (53.7)	139.4	354.1	122.2
Village name
Busanga	63	25 (39.7)	17 (45.9)	8 (30.8)	64	37 (57.8)	26 (68.4)	11 (42.3)	132.6	159.8	92.8
Bwai	92	13 (14.1)	10 (24.4)	3 (5.8)	97	71 (73.1)	26 (61.9)	45 (81.3)	228.5	217.1	237.2
Kibuyi	93	29 (31.2)	27 (42.9)	2 (6.5)	98	65 (66.3)	48 (72.7)	17 (53.1)	171.1	208.9	93.0
Mwiringo	93	13 (14.0)	11 (20.4)	2 (5.0)	96	41 (42.7)	23 (41.8)	18 (43.9)	49.4	62.8	31.3
Sota	34	4 (11.8)	1 (7.7)	3 (13.6)	57	18 (31.6)	8 (34.8)	10 (29.4)	98.8	88.2	96.0
Total	375	84 (22.7)	66 (31.7)	18 (10.8)	412	232 (56.3)	131 (58.5)	101 (53.7)	149.1	354.1	122.2