Table 2.

Pooled prevalence estimates for STH infections in Nigerian children stratified according to sub-groups

Variables	No. of studies	Pooled prevalence estimates			95% CI	Heterogeneity
		Sample size	Positives	Prevalence (%)		I2 (%)	Q-P
Region
North-central	6	3156	1507	47.8	46.0–49.5	99.4	0.000
North-east	1	250	114	45.6	39.3–52.0	0.0	0.000
North-west	2	1370	181	13.2	11.5–15.1	90.0	0.002
South-east	7	4653	2174	46.7	45.3–48.2	99.4	0.000
South-south	10	8264	3953	47.8	46.8–48.9	98.8	0.000
South-west	15	16 825	10 972	65.2	64.5–65.9	99.5	0.000
Study period
1980–1991	4	8330	6736	80.9	80.0–81.7	98.9	0.000
1992–2003	7	7682	3932	51.2	50.1–52.3	99.5	0.000
2004–2014	30	18 506	8233	44.5	43.8–45.2	99.1	0.000
Sample size
100–500	23	6903	3375	48.9	47.7–50.1	98.6	0.000
501–1000	6	4306	2176	50.5	49.3–52.0	99.6	0.000
1001–1500	7	7996	5473	68.5	67.4–69.5	99.6	0.000
> 1500	5	15 313	7877	51.4	50.7–52.2	99.8	0.000
Study setting
Community-based	9	4936	2914	59.0	57.7–60.4	99.4	0.000
Hospital-based	2	517	214	41.4	37.1–45.8	99.1	0.000
School-based	30	29 065	15 773	54.3	53.7–54.8	99.5	0.000
SPSAG
SAC	33	30 319	16 643	54.9	54.3–55.5	99.5	0.000
PSAC	8	4199	2258	53.8	52.3–55.3	99.2	0.000
Overall	41	34 518	18 901	54.8	54.2–55.3	99.4	0.000

CI Confidence interval, I² Inverse variance index, Q-P Cochran’s P-value, SPSAG School/Preschool-age groups, SAC School-aged children, PSAC Preschool-aged children