Table 3.

Prevalence of S. mansoni-related portal fibrosis among 706 recruited participants who underwent abdominal ultrasound examination

Variables	Total examined	Portal fibrosis (%)	95% CI	P value
Overall	706	25.6	22.4–28.8
Gender
Female	437	28.0	23.7–32.1
Male	269	22.0	16.9–26.9	0.077*
Age group (years)
7–9	50	14.0	4.3–23.7
10–14	96	16.7	9.1–24.2
15–19	98	18.4	10.6–26.0
20–24	54	18.5	8.0–29.0
25–29	67	28.3	17.4–39.2
30–39	140	31.4	23.7–39.1
40+	201	33.3	26.8–39.9	0.002*
Study area
Luampa	362	30.0	25.3–34.7
Mangango	81	16.0	9.0–23.1
Mwandasengo	105	21.2	12.2–30.3
Namando	158	27.2	20.2–34.2	0.017*

^*χ² test.