Table 3.

Comparison of the incidence and risk factors of Opisthorchis viverrini infection between 2 cohort studies in this area

	Rangsin et al. [18]	The present study
Study duration	2002-2004	2007-2009
Incidence (/100 person-years)	21.6	21.4
Significant risk factors (Adjusted RR, 95% CI)
Age 20–39 years	3.1 (1.1-8.2)*
Age 40–59 years	2.7 (1.0-7.4)*
Age ≥ 60 years	4.1 (1.45-11.8)*	1.9 (1.0 – 3.4)**
Consuming Koi pla	1.9 (1.1-3.3)	1.6 (1.1-2.3)

*compared with 0–19 age group, ** compared with 0–24 age group.