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Table 3 Odds ratios for school based screening in multivariable logistic regression models including the significant variables from stepwise selection

From: Factors associated with Chlamydia trachomatis testing in a high school based screening and previously in clinical practice: a cross-sectional study in Norway

   Girls    Boys    All participants  
Characteristic OR 95% CI p 1 OR 95% CI p 1 OR 95% CI p 1
Gender          
 Girls2 NA    NA    0.57 0.34–0.97 0.040
Age          
 OR per year 0.91 0.65–1.27 0.58 0.82 0.52–1.28 0.39 0.86 0.67–1.11 0.24
High school          
Study affiliation          
 Academic 1.00   0.001 ns    1.00   0.013
 Vocational 0.33 0.17–0.65   ns    0.51 0.30–0.87  
Alcohol/drug use          
 Low ns    1.00   0.039 ns   
 Medium ns    0.75 0.22 to 2.58   ns   
 High ns    0.26 0.08 to 0.91   ns   
Sexual behaviour          
Age first intercourse          
 ≥15 years ns    1.00   0.001 1.00   0.029
 ≤14 years ns    0.23 0.10–0.57   0.58 0.35–0.95  
Condom use first intercourse          
 Yes 1.00   0.010 ns    1.00   0.026
 No3 0.42 0.21–0.82   ns    0.57 0.35–0.94  
Condom use last intercourse          
 Yes ns    1.00   0.003 ns   
 No4 ns    3.86 1.59–9.41   ns   
Chlamydia infection          
Urogenital symptoms5          
 No 1.00   <0.001 ns    1.00   0.001
 Yes 4.26 1.89–9.63   ns    3.23 1.57–6.65  
  1. Age and gender (if applicable) included in the model.
  2. OR, odds ratio; CI, confidence interval; NA, not applicable; ns non-significant, 1 p-value for equality between categories; 2Reference group: boys; 3Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10); 4Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8); 5In girls: dysuri, vaginal discharge, intermenstrual and/or postcoital bleeding. In boys: dysuri and/or urethral discharge.