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Table 3 Odds ratios for C. trachomatis infection in multivariable logistic regression models

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

Characteristic Girls Boys Both
OR 95% CI p 1 OR 95% CI p 1 OR 95% CI p 1
Family and culture          
Residence in school year          
At home -    -    1.00   0.013
Other2 -    -    2.04 1.17–3.57  
Mother’s education          
≤High school/don’t know 1.00   0.021 -    -   
≥College 2.22 1.13–4.37   -    -   
Sexual behaviour          
Condom use first intercourse          
No -    1.00   0.005 -   
Yes -    0.06 0.01–0.42   -   
Sex partners past 6 months          
0-1 1.00   <0.001 -    1.00   <0.001
≥ 2 3.59 1.76–7.32   -    2.88 1.60–5.18  
Last sexual partner          
Age difference          
Same age or younger -    1.00   0.017 -   
Older (≥1 year) -    3.74 1.27–11.01   -   
How met last partner          
At school/work 1.00   0.038     1.00   0.026
Through family/friends/other 1.90 0.42–8.65   -    1.61 0.54–4.82  
On the Internet 3.40 0.62–18.78   -    2.81 0.78–0.08  
At a private party, bar, disco 4.99 1.10–22.69   -    3.54 1.18–10.61  
Last sexual intercourse          
Condom use          
No -    -    1.00   0.015
Yes -    -    0.23 0.07–0.75  
  1. OR odds ratio, CI confidence interval, 1p-value for equality between categories; 2Living with relatives, in students’ houses or private accommodation.
  2. The multivariable models include the significant variables from backwards stepwise procedure. Age and gender (if applicable) included in all models.