Table 1 Sosio-demographic characteristics, prevalence and crude odds ratios for C. trachomatis infection in univariable logistic regression analysis

Total

565

(100.0)

41

(7.3)

466

(100.0)

18

(3.9)

Age

16

168

(29.7)

11

(6.5)

1.00

0.48

139

(29.8)

3

(2.2)

1.00

0.38

1.00

0.21

17

177

(31.3)

15

(8.5)

1.32

0.59 to 2.97

179

(38.4)

9

(5.0)

2.40

0.64 to 9.04

1.51

0.76 to 3.00

18

166

(29.4)

9

(5.4)

0.82

0.33 to 2.03

106

(22.7)

3

(2.8)

1.32

0.26 to 6.68

0.97

0.44 to 2.13

19-20

48

(9.6)

6

(11.1)

1.78

0.63 to 5.08

39

(9.0)

3

(7.1)

3.49

0.68 to 17.97

2.17

0.91 to 5.17

Family and culture

Ethnicity

Norwegian

402

(71.2)

23

(5.7)

1.00

0.093

325

(70.0)

12

(3.7)

1.00

0.73

1.00

0.21

Sami/Sami-Norwegian

124

(21.9)

14

(11.3)

2.10

1.04 to 4.21

105

(22.6)

3

(2.9)

0.74

0.21 to 2.77

1.59

0.87 to 2.89

Other

39

(6.9)

4

(10.3)

1.88

0.61 to 5.75

34

(7.3)

2

(5.9)

1.63

0.35 to 7.61

1.77

0.72 to 4.36

Church affiliation²

Yes

448

(79.6)

33

(7.4)

1.00

0.88

294

(63.5)

12

(4.1)

1.00

0.54

1.00

0.36

No

115

(20.4)

8

(7.0)

0.94

0.42 to 2.10

169

(36.5)

5

(3.0)

0.72

0.25 to 2.07

0.74

0.40 to 1.40

Residence in school year

At home

356

(63.1)

20

(5.6)

1.00

0.051

287

(61.7)

7

(2.4)

1.00

0.084

1.00

0.011

Other³

208

(36.9)

21

(10.1)

1.89

1.00 to 3.57

178

(38.3)

10

(5.6)

2.38

0.89 to 6.37

2.00

1.17 to 3.4

Mother’s education

≤ High school/don’t know

313

(55.5)

15

(4.8)

1.00

0.013

304

(65.7)

12

(3.9)

1.00

0.66

1.00

0.03

≥ College

251

(44.5)

26

(10.4)

2.30

1.19 to 4.44

159

(34.3)

5

(3.1)

0.79

0.27 to 2.28

1.79

1.05 to 3.04

High school

Study category

Academic

347

(61.4)

21

(6.1)

1.00

0.17

171

(36.8)

6

(3.5)

1.00

0.90

1.00

0.56

Vocational

218

(38.6)

20

(9.2)

1.57

0.83 to 2.97

294

(63.2)

11

(3.7)

1.07

0.39 to 2.94

1.17

0.69 to 1.99

Year

1

210

(37.2)

16

(7.6)

1.00

0.68

178

(38.3)

4

(2.2)

1.00

0.44

1.00

0.83

2

198

(35.0)

16

(8.1)

1.07

0.52 to 2.19

209

(44.9)

9

(4.3)

1.96

0.59 to 6.47

1.20

0.66 to 2.21

3

157

(27.8)

9

(5.7)

0.74

0.32 to 1.72

78

(16.8)

4

(5.1)

2.35

0.57 to 9.65

1.08

0.53 to 2.21

Alcohol/drug use

Low

134

(23.8)

4

(3.0)

1.00

0.098

130

(28.4)

3

(2.3)

1.00

0.087

1.00

0.034

Medium

322

(57.3)

27

(8.4)

2.98

1.02 to 8.67

198

(43.3)

5

(2.5)

1.10

0.26 to 4.67

2.41

1.05 to 5.53

High

106

(18.9)

10

(9.4)

3.39

1.03 to 11.12

129

(28.2)

9

(7.0)

3.18

0.84 to 12.01

3.23

1.33 to 7.83