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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).