Table 1. Prevalence of intestinal parasitic infections diagnosed by Kato-Katz plus formalin-ethyl-acetate concentration (n = 669).

Parasites	Prevalence (95% CI)	Study settings			Sex		Age groups (years)
	(n = 669)	Khong (n = 225)	Mounlapamok (n = 232)	Paksong (n = 212)	Female (n = 347)	Male (n = 322)	≤5 (n = 116)	6–15 (n = 220)	16–30 (n = 110)	31–55 (n = 167)	>55 (n = 56)
Trematodes
O. viverrini	64.3 (60.6–67.9)	92.0	90.9	5.7**	65.1	63.4	44.0	64.6	69.1	70.1	78.6
S. mekongi	24.2 (21.0–27.5)	68.0	3.9	0.0**	24.2	24.2	9.9	30.0	15.4	22.2	32.1
Echinostoma spp.	6.0 (4.2–7.8)	12.9	4.7	0.0**	6.1	5.9	3.5	4.6	4.6	5.4	5.4
Nematodes
Hookworm	76.8 (73.6–80.0)	71.1	66.0	94.8**	76.7	77.0	39.7	80.0	31.8	78.4	75.0
A. lumbricoides	31.7 (28.2–35.2)	7.1	6.0	85.9**	31.7	31.7	39.7	31.8	31.8	29.9	23.2
T. trichiura	25.0 (21.7–28.3)	13.3	8.2	55.7**	23.6	26.4	19.0	26.4	26.4	25.2	14.3
S. stercoralis	4.6 (3.0–6.0)	9.8	3.9	0.0**	14.9	4.4	4.3	1.8	1.8	7.8	5.4
E. vermicularis	3.6 (2.2–5.0)	3.1	4.4	3.3	5.2	1.9*	2.6	2.7	3.6	3.6	8.9
Cestodes
Taenia spp.	3.7 (2.3–5.2)	1.8	4.3	5.2	3.1	4.7	0.9	2.7	3.6	6.0	7.1
H. diminuta	2.7 (1.5–3.9)	0.0	0.0	8.5**	2.9	2.5	1.7	2.3	2.7	3.6	3.6
D. latum	0.5 (<0.1–0.9)	0.5	0.9	0.0	0.6	0.3	0.9	0.5	0.9	0.0	0.0
Intestinal protozoa
B. hominis	13.6 (11.0–16.2)	19.6	6.5	15.1**	13.0	14.3	7.8	15.0	13.6	15.0	16.1
E. coli	7.2 (5.2–9.1)	3.0	8.4	10.4**	7.8	6.5	6.0	7.3	9.1	4.8	12.5
G. intestinalis	4.9 (3.3–6.6)	3.0	5.9	6.1	2.6	7.6*	5.2	6.4	8.2	1.8	1.8
E. nana	0.6 (<0.1–1.2)	0.6	0.4	0.5	0.3	0.9	0.9	0.9	0.0	0.6	0.0

CI, confidence interval.

*P-value <0.05;

**P-value <0.001.

P-value based on likelihood ratio test