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Table 2 Odds ratios for clinic based testing in multivariable logistic regression models

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 participants1  
Characteristic OR 95% CI p 2 OR 95% CI p 2 OR 95% CI p 2
Gender: girls vs boys 3          
 Norwegian NA    NA    7.96 5.26–12.04 < 0.001
 Sami/Sami-Norwegian NA    NA    3.62 1.92–6.82 < 0.001
 Other NA    NA    1.89 0.66–5.45 0.24
Age          
 OR per year 1.47 1.20–1.81 < 0.001 1.73 1.28–2.32 < 0.001 1.54 1.30–1.83 < 0.001
Family and culture          
Ethnicity girls4          
 Norwegian ns    NA    1.00   0.37
 Sami/Sami-Norwegian ns    NA    1.30 0.82–2.08  
 Other ns    NA    0.78 0.38–1.60  
Ethnicity boys5          
 Norwegian NA    1.00   < 0.001 1.00   < 0.001
 Sami/Sami-Norwegian NA    2.83 1.56–5.13   2.86 1.59–5.14  
 Other NA    3.53 1.44–8.64   3.28 1.37–7.84  
Sexual behaviour          
Age at first intercourse          
 ≥15 years 1.00   0.006 1.00   0.003 1.00   < 0.001
 ≤14 years 1.78 1.18–2.67   2.56 1.39–4.71   2.02 1.43–2.85  
Condom use first intercourse          
 Yes ns    ns    1.00   0.013
 No6 ns    ns    1.48 1.09–2.01  
Currently in a relationship          
 Yes ns    ns    1.00   0.009
 No ns    ns    0.66 0.49–0.90  
Lifetime no of sex partners          
 1-2 1.00   < 0.001 1.00   < 0.001 1.00   < 0.001
 3-5 2.42 1.59–3.71   4.22 1.95–9.12   3.07 2.11–4.46  
 ≥6 6.31 3.85–10.34   8.57 3.91–18.79   7.63 5.03–11.55  
Condom use last intercourse          
 Yes 1.00   0.011 ns    ns   
 No7 1.93 1.16–3.20   ns    ns   
  1. The significant variables from stepwise selection, age and gender (if applicable) were included in the models.
  2. OR, odds ratio; CI, confidence interval; NA, not applicable; ns, non-significant; 1Interaction term between gender and ethnicity included in the model (p 0.012); 2 p-value for equality between categories; 3Reference group: boys; 4Odds ratios in girls; 5Odds ratios in boys; 6Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10); 7Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8).