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Table 1 Sosio-demographic characteristics, 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
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  
  1. n CT number of chlamydia cases, OR odds ratio, CI confidence interval, 1p-value for equality between categories; 2Affiliation to any denomination: Church of Norway (n = 722), Russian Orthodox Church (n = 9), Jehova’s Witnesses/Pentecostals (n = 7), Islam (n = 4); 3Living with relatives, in students’ houses or in private accommodation.