Table 2. Negative binomial regression analyses for parasite eggs count in Champasack province (n = 669).

	O. viverrini		S. mekongi		Hookworm		A. lumbricoides		T. trichiura
	IRR (95% CI)	P-value	IRR (95% CI)	P-value	IRR (95% CI)	P-value	IRR (95% CI)	P-value	IRR (95% CI)	P-value
Sex
Female	1.00		1.00		1.00		1.00		1.00
Male	0.92 (0.76–1.11)	0.404	1.18 (0.85–1.64)	0.308	1.08 (0.93–1.25)	0.321	0.96 (0.81–1.12)	0.593	0.91 (0.72–1.16)	0.437
Age groups (years)
≤ 5	1.00		1.00		1.00		1.00		1.00
6–15	2.95 (2.08–4.19)		1.79 (1.01–3.18)		1.49 (1.17–1.90)		1.25 (0.98–1.61)		1.10 (0.74––1.64)
16–30	5.37 (3.68–7.84)		1.39 (0.72–2.68)		1.30 (0.99–1.69)		0.85 (0.63–1.13)		0.98 (0.63–1.54)
31–55	7.18 (5.01–10.29)		1.06 (0.57–1.96)		1.16 (0.90–1.50)		1.09 (0.84–1.42)		0.88 (0.58–1.34)
>55	7.41 (4.82–11.42)	<0.001	1.30 (0.63–2.67)	0.102	1.19 (0.85–1.67)	0.008	0.81 (0.55–1.19)	0.170	1.29 (0.66–2.53)	0.605

CI, confidence interval; IRR, intensity rate ratio.

P-value obtained from likelihood ratio test.