Table 1. Baseline prevalence of infection of the main helminth species and infection intensity among egg-positive children.

	Full 3×3 data at baseline (n = 90)				Full 3×3 data at baseline and 28–30 days posttreatment follow-up (n = 64)
Helminth species	Prevalence (%)	95% CI	Infection intensity (EPG)	95% CI	Prevalence (%)	95% CI	Infection intensity (EPG)	95% CI
S. mekongi	87.8	79.2–93.7	25	18–33	85.9	75.0–93.4	28	20–40
O. viverrini	98.9	n.d.	342	229–510	98.4	n.d.	337	201–566
Hookworm	96.7	n.d.	321	221–464	95.3	n.d.	252	157–403
T. trichiura	23.3	15.1–33.4	13	7–24	18.8	10.1–30.5	9	4–21
A. lumbricoides	7.8	3.2–15.4	124	9–1,506	6.3	n.d.	16	1–141
E. vermicularis	7.8	3.2–15.4	12	2–53	6.3	n.d.	10	0–242
Taenia spp.	6.7	2.5–13.9	6	2–17	4.7	n.d.	9	0–112

Study was carried out among 93 children in primary and secondary schools on Don Long Island, Khong district, Champasack province, Lao PDR in February and March 2007. Full 3×3 data refers to children who provided 3 stool specimens over consecutive days, with triplicate Kato-Katz thick smear examinations per stool specimen.

CI, confidence interval; EPG, eggs per gram of stool; n.d., not defined.