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Table 2 Sexual behaviour, prevalence and crude odds ratios for C. trachomatis infection in univariable logistic regression analysis

From: Early sexual behaviour and Chlamydia trachomatisinfection – a population based cross-sectional study on gender differences among adolescents in Norway

Characteristic

Girls

Boys

Both

N

(%)

nCT

(%)

OR

95% CI

p 1

N

(%)

nCT

(%)

OR

95% CI

p 1

OR

95% CI

p 1

Sexual behaviour

                 

Age at first intercourse

                 

≥ 15 years

330

(58.8)

24

(7.3)

1.00

 

0.97

294

(65.9)

8

(2.7)

1.00

 

0.10

1.00

 

0.27

≤ 14 years

231

(41.2)

17

(7.4)

1.01

0.53 to 1.93

 

152

(34.1)

9

(5.9)

2.25

0.85 to 5.96

 

1.35

0.79 to 2.30

 

Years sexually active

                 

≤ 1 year

149

(26.6)

10

(6.7)

1.00

 

0.74

158

(35.4)

2

(1.3)

1.00

 

0.055

1.00

 

0.099

≥ 2 years

412

(73.4)

31

(7.5)

1.13

0.54 to 2.37

 

288

(64.6)

15

(5.2)

4.29

0.97 to 18.99

 

1.73

0.90 to 3.31

 

Condom use first intercourse

                 

No2

223

(39.6)

14

(6.3)

1.00

 

0.46

206

(45.3)

16

(7.8)

1.00

 

0.003

1.00

 

0.13

Yes

340

(60.4)

27

(7.9)

1.29

0.66 to 2.51

 

249

(54.7)

1

(0.4)

0.05

0.01 to 0.36

 

0.75

0.39 to 1.13

 

Currently in a relationship

                 

Yes

296

(52.4)

19

(6.4)

1.00

 

0.42

167

(35.8)

6

(3.6)

1.00

 

0.82

1.00

 

0.69

No

269

(47.6)

22

(8.2)

1.30

0.69 to 2.46

 

299

(64.2)

12

(4.0)

1.12

0.41 to 3.05

 

1.12

0.66 to 1.90

 

Sex partners past 6 months

                 

0-1

323

(57.9)

12

(3.7)

1.00

 

<0.001

254

(58.8)

6

(2.4)

1.00

 

0.053

1.00

 

<0.001

≥ 2

235

(42.1)

29

(12.3)

3.65

1.82 to 7.31

 

178

(41.2)

11

(6.2)

2.72

0.99 to 7.50

 

3.33

1.88 to 5.90

 

Lifetime no of sex partners

                 

1-2

192

(34.5)

6

(3.1)

1.00

 

0.002

203

(47.8)

4

(2.0)

1.00

 

0.24

1.00

 

<0.001

3-5

178

(32.0)

11

(6.2)

2.04

0.74 to 5.64

 

117

(27.5)

4

(3.4)

1.76

0.43 to 7.18

 

2.06

0.91 to 4.66

 

≥ 6

186

(33.5)

24

(12.9)

4.59

1.83 to 11.51

 

105

(24.7)

6

(5.7)

3.02

0.83 to 10.93

 

4.43

2.13 to 9.21

 

Last sexual partner

                 

Age difference

                 

Same age or younger

133

(24.3)

7

(5.3)

1.00

 

0.30

381

(88.0)

11

(2.9)

1.00

 

0.005

1.00

 

0.002

Older (≥ 1 year)

414

(75.7)

33

(8.0)

1.56

0.67 to 3.61

 

52

(12.0)

6

(11.5)

4.39

1.55 to 12.42

 

2.52

1.42 to 4.47

 

How met last partner

                 

At school/work

66

(11.7)

2

(3.0)

1.00

 

0.008

104

(23.0)

2

(1.9)

1.00

 

0.65

1.00

 

0.008

Through family/friends/other

312

(55.4)

16

(5.1)

1.73

0.39 to 7.71

 

187

(41.4)

4

(4.2)

1.98

0.40 to 9.73

 

2.01

0.68 to 5.89

 

On the Internet

58

(10.3)

5

(8.6)

3.02

0.56 to 16.19

 

47

(10.4)

2

(4.3)

2.27

0.31 to 16.60

 

2.96

0.85 to 10.38

 

At a private party, bar, disco

127

(22.6)

18

(14.2)

5.28

1.19 to 23.52

 

114

(25.2)

6

(5.3)

2.83

0.56 to 14.36

 

4.59

1.56 to 13.48

 

Type of relationship

                 

Regular partner/sweetheart

324

(57.4)

20

(6.2)

1.00

 

0.31

209

(46.3)

5

(2.4)

1.00

 

0.090

1.00

 

0.51

Ex partner/sweetheart

74

(13.1)

8

(10.8)

1.84

0.78 to 4.36

 

51

(11.3)

1

(2.0)

0.82

0.093 to 7.14

 

1.58

0.72 to 3.47

 

A friend I have sex with

103

(18.3)

6

(5.8)

0.94

0.37 to 2.41

 

95

(21.1)

8

(8.4)

3.75

1.19 to 11.79

 

1.55

0.79 to 3.04

 

Casual contact/other

63

(11.2)

7

(11.1)

1.91

0.77 to 4.71

 

96

(21.3)

3

(3.1)

1.32

0.31 to 5.62

 

1.36

0.64 to 2.90

 

Last sexual intercourse

                 

Condom use

                 

No3

474

(84.0)

39

(8.2)

1.00

 

0.062

300

(66.5)

16

(5.3)

1.00

 

0.039

1.00

 

0.003

Yes

90

(16.0)

2

(2.2)

0.25

0.06 to 1.07

 

151

(33.5)

1

(0.7)

0.12

0.02 to 0.90

 

0.17

0.05 to 0.53

 

Related alcohol/drug use

                 

No

460

(81.7)

30

(6.5)

1.00

 

0.15

343

(76.2)

11

(3.2)

1.00

 

0.26

1.00

 

0.10

Yes

103

(18.3)

11

(10.7)

1.71

0.83 to 3.54

 

107

(23.8)

6

(5.6)

1.79

0.65 to 4.97

 

1.64

0.91 to 2.94

 

Chlamydia infection

                 

Test prior to study

                 

No

251

(45.5)

18

(7.2)

1.00

 

0.94

368

(79.1)

11

(3.0)

1.00

 

0.14

1.00

 

0.11

Yes

313

(55.5)

23

(7.3)

1.03

0.54 to 1.95

 

97

(20.9)

6

(6.2)

2.14

0.77 to 5.94

 

1.55

0.91 to 2.63

 

Treatment for infection

                 

No

452

(80.1)

30

(6.6)

1.00

 

0.25

433

(93.3)

16

(3.7)

1.00

 

0.87

1.00

 

0.13

Yes

112

(19.9)

11

(9.8)

1.53

0.74 to 3.16

 

31

(6.7)

1

(3.2)

0.87

0.11 to 6.78

 

1.67

0.86 to 3.24

 
  1. nCT, number of chlamydia cases, OR, odds ratio, CI, confidence interval, 1p-value for equality between categories, 2Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10), 3Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8).