Table 1.
Sosiodemographic and sexual behaviour characteristics - prevalence and crude odds ratios for clinic based testing
| |
Girls |
|
|
|
|
|
Boys |
|
All participants |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |
Clinic based testing |
|
|
|
|
|
Clinic based testing |
|
|
Interaction |
||||
| Characteristic | N | n | (%) | OR | 95% CI | p1 | N | n | (%) | OR | 95% CI | p1 | p1 | p2 |
|
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 | ||||
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; 1p-value for equality between categories; 2p-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).