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Table 1 Sosiodemographic and sexual behaviour characteristics - prevalence and crude odds ratios for clinic based testing

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
  Clinic based testing       Clinic based testing    Interaction
Characteristic N n (%) OR 95% CI p 1 N n (%) OR 95% CI p 1 p 1 p 2
Total 607 338 (55.7) NA    505 106 (21.0) NA     
Age               
 15-16 179 81 (45.3) 1.00   < 0.001 149 19 (12.8) 1.00   0.001 < 0.001 0.80
 17 193 105 (54.4) 1.44 0.96–2.17   196 40 (20.4) 1.75 0.97–3.18    
 18 177 104 (58.8) 1.72 1.13–2.62   114 28 (24.6) 2.23 1.17–4.24    ,
 19-20 58 48 (82.8) 5.81 2.77–12.20   46 19 (41.3) 4.81 2.25–10.29    
Family and culture               
Ethnicity        ,        
 Norwegian 433 232 (53.6) 1.00   0.049 353 56 (15.9) 1.00   < 0.001 0.001 0.022
 Sami/Sami-Norwegian 131 85 (64.9) 1.60 1.07–2.40   115 37 (32.2) 2.52 1.55–4.08    
 Other 43 21 (48.8) 0.83 0.44–1.55   36 13 (36.1) 3.00 1.43–6.27    
Residence in school year               
 At home 380 196 (51.6) 1.00   0.007 314 55 (17.5) 1.00   0.015 0.001 0.78
 Other3 226 142 (62.8) 1.59 1.13–2.22   191 51 (26.7) 1.72 1.11–2.65    
Mothers education               
 ≤ High school/don’t know 338 184 (54.4) 1.00   0.46 334 62 (18.6) 1.00   0.074 0.005 0.32
 ≥ College 268 154 (57.5) 1.13 0.82–1.56   169 43 (25.4) 1.50 0.96–2.33    
High school               
Study affiliation               
 Academic 323 189 (52.1) 1.00   0.029 181 45 (24.9) 1.00   0.11 0.040 0.010
 Vocational 244 149 (61.1) 1.44 1.04–2.01   324 61 (18.8) 0.70 0.45–1.09    
Alcohol/drug use               
 Low 144 57 (40.4) 1.00   < 0.001 140 21 (15.3) 1.00   0.003 < 0.001 0.49
 Medium 343 193 (56.3) 1.90 1.27–2.82   212 40 (18.9) 1.29 0.72–2.29    
 High 118 86 (72.9) 3.96 2.34–6.71   144 45 (31.3) 2.51 1.40–4.50    
Sexual behaviour               
Age at first intercourse               
 ≥ 15 years 352 167 (47.4) 1.00   < 0.001 311 40 (12.9) 1.00   < 0.001 < 0.001 0.15
 ≤ 14 years 252 171 (67.9) 2.34 1.67–3.28   172 59 (34.3) 3.54 2.24–5.59    
Years sexually active               
 ≤ 1 year 162 54 (33.3) 1.00   < 0.001 171 13 (7.6) 1.00   < 0.001 < 0.001 0.50
 ≥ 2 years 442 284 (64.3) 3.60 2.46–5.26   312 86 (27.6) 4.63 2.50–8.58    
Condom use first intercourse               
 Yes 358 198 (55.3) 1.00   0.78 267 40 (15.0) 1.00   0.001 0.15 0.014
 No4 248 140 (56.5) 1.05 0.76–1.45   226 61 (27.0) 2.10 1.34–3.28    
Currently in relationship               
 Yes 322 185 (57.5) 1.00   0.35 179 42 (23.5) 1.00   0.31 0.001 0.79
 No 285 153 (53.7) 0.86 0.62–1.18   326 64 (19.6) 0.80 0.51–1.24    
Sex partners past 6 months               
 0-1 352 181 (51.4) 1.00   0.010 273 35 (12.8) 1.00   < 0.001 < 0.001 0.013
 ≥ 2 248 154 (62.1) 1.55 1.11–2.16   194 62 (32.0) 3.19 2.01–5.09    
Life time no of sex partners               
 1-2 206 64 (31.1) 1.00   < 0.001 218 11 (5.0) 1.00   < 0.001 < 0.001 0.17
 3-5 191 107 (56.0) 2.83 1.87–4.26   123 31 (25.2) 6.34 3.06–13.16    
 ≥ 6 201 163 (81.1) 9.52 6.01–15.08   119 53 (44.5) 15.11 7.46–30.62    
Last sexual partner               
Age difference               
 Same age or younger 144 66 (45.8) 1.00   0.005 413 80 (19.4) 1.00   0.042 < 0.001 0.78
 Older (≥ 1 year) 445 264 (59.3) 1.72 1.18–2.52   54 17 (31.5) 1.91 1.03–3.57    
Condom use last intercourse               
 Yes 94 33 (35.1) 1.00   < 0.001 319 76 (23.8) 1.00   0.009 < 0.001 0.36
 No5 513 305 (59.5) 2.71 1.71–4.29   168 23 (13.7) 1.97 1.18–3.28    
School based testing               
Provision of urine sample               
 Yes 564 313 (55.5) 1.00   0.74 470 97 (20.6) 1.00   0.48 0.49 0.73
 No 43 25 (58.1) 1.11 0.59–2.09   35 9 (25.7) 1.33 0.60–2.93    
Chlamydia test result               
 Negative 523 290 (55.4) 1.00   0.94 448 91 (20.3) 1.00   0.14 0.11 0.23
 Positive 41 23 (56.1) 1.03 0.54–1.95   17 6 (35.3) 2.14 0.77–5.94    
  1. N, total number of participants in each group; n (%), number (proportion) of participants with clinic based testing; OR, odds ratio; CI, confidence interval; NA, not applicable; 1 p-value for equality between categories; 2 p-value for interaction between gender and independent variable; 3Living with relatives, in students’ houses or in private accommodation; 4Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10); 5Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8).