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Table 2 Univariate and multivariate analysis of risk factors for acquiring Opisthorchis viverrini infection

From: A follow-up study of Opisthorchis viverrini infection after the implementation of control program in a rural community, central Thailand

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)

  1. 95% CI = 95% confidence interval.
  2. Adjusted for occupation, briefly fermented fish and extensively fermented fish.