Table 3.

Pooled prevalence of SHS prevalence. Test for heterogeneity.

Study	Sample size	Proportion (%)	95% CI	Weight (%)
GATS 12	6972	36.804	35.671-37.949	14.49
GATS 13	7563	49.002	47.869-50.135	14.49
Chau Quy Ngo 14	432	64.583	59.870-69.096	14.04
Rang 15	576	59.201	55.062-63.246	14.16
Motoi Suzuki 16	167 298	50.068	49.828-50.308	14.52
Dien 18	340	25.294	20.759-30.265	13.92
Dang 17	1740	90.920	89.471-92.228	14.40
Total (random effects)	184 921	54.614	44.900-64.154	100.00