Table 2.
Univariate and multivariate analysis of risk factors for acquiring Opisthorchis viverrini infection
| Characteristics | Number of O. viverrini infected persons | Person-years of follow up | Incidence rate (/100 person-years) | Crude relative risk (95% CI) | Adjusted relative risk (95% CI) |
|---|---|---|---|---|---|
|
Gender |
|
|
|
|
|
| Female |
85 |
476.7 |
17.8 |
1 |
1 |
| Male |
105 |
407.0 |
25.8 |
1.5 |
1.3 |
| (1.1-2.0) |
(0.9-1.8) |
||||
|
Age group (years) |
|
|
|
|
|
| 0-24 |
16 |
130.5 |
12.3 |
1 |
1 |
| 25-59 |
78 |
326.0 |
23.9 |
2.0 |
1.6 |
| (1.1-3.3) |
(0.9-2.8) |
||||
| 60+ |
98 |
440.2 |
22.3 |
1.8 |
1.9 |
| (1.1-3.1) |
(1.0-3.4) |
||||
|
Occupation |
|
|
|
|
|
| Others |
60 |
248.2 |
24.2 |
1 |
|
| Agriculture |
66 |
282.8 |
23.3 |
1.0 |
- |
| (0.7-1.4) | |||||
|
Fish menus |
|
|
|
|
|
| Chopped raw fish salad (Koi pla) |
|
|
|
|
|
| No |
50 |
294.0 |
17.0 |
1 |
1 |
| Yes |
80 |
262.7 |
30.5 |
1.8 |
1.6 |
| (1.2-2.6) |
(1.1-2.3) |
||||
| Briefly fermented fish (Pla som) |
|
|
|
|
|
| No |
25 |
96.8 |
25.8 |
1 |
|
| Yes |
54 |
182.7 |
29.6 |
1.2 |
- |
| (0.7-1.9) | |||||
| Extensively fermented fish (Pla ra) |
|
|
|
|
|
| No |
16 |
62.0 |
25.8 |
1 |
|
| Yes | 64 | 217.5 | 29.4 | 1.1 |
- |
| (0.7-2.1) |
95% CI = 95% confidence interval.
Adjusted for occupation, briefly fermented fish and extensively fermented fish.