Table 2 Crude and adjusted odds ratio between history of praziquantel treatments and O. viverrini infection and 95% confidence interval adjusted for all other factors using multiple logistic regression

Over all

NA^b

NA^b

NA^b

NA^b

 Never

1

1

 Once

1.23

1.09

0.88–1.37

0.433

 Twice

1.38

1.19

0.85–1.68

0.310

 Three times

1.50

1.28

0.74–2.21

0.375

 More than three times

2.17*

1.86

1.18–2.93

0.007

 Women

1

1

 Men

1.27*

1.07

0.79–1.44

0.667

 40–44

1

1

 45–49

1.42

1.32

0.89–1.96

0.168

 50–54

1.73*

1.54

1.05–2.25

0.027

 55–59

1.78*

1.59

1.08–2.36

0.019

 60 years and over

2.63*

2.10

1.44–3.04

0.000

 Primary and lower

1

1

 Secondary

0.62*

0.76

0.60–0.96

0.022

 Certificate and higher

0.29*

0.48

0.27–0.86

0.013

 Unemployed

1

1

 Farmer

1.04

1.16

0.70–1.91

0.572

 Others

0.44*

0.65

0.36–1.15

0.140

 No

1

1

 Yes, current or previous

1.37*

1.15

0.84–1.58

0.375

 No

1

1

 Yes, current or previous

1.05

0.96

0.76–1.21

0.749

 No

1

1

 Yes, current or previous

1.12

0.97

0.65–1.47

0.908

 < 1 km

1

1

 1 km and over

0.53*

0.60

0.37–0.97

0.038