Table 3.
Odds ratios for school based screening in multivariable logistic regression models including the significant variables from stepwise selection
| |
|
Girls |
|
|
Boys |
|
|
All participants |
|
|---|---|---|---|---|---|---|---|---|---|
| Characteristic | OR | 95% CI | p1 | OR | 95% CI | p1 | OR | 95% CI | p1 |
|
Gender |
|
|
|
|
|
|
|
|
|
| Girls2 |
NA |
|
|
NA |
|
|
0.57 |
0.34–0.97 |
0.040 |
|
Age |
|
|
|
|
|
|
|
|
|
| OR per year |
0.91 |
0.65–1.27 |
0.58 |
0.82 |
0.52–1.28 |
0.39 |
0.86 |
0.67–1.11 |
0.24 |
|
High school |
|
|
|
|
|
|
|
|
|
| Study affiliation |
|
|
|
|
|
|
|
|
|
| Academic |
1.00 |
|
0.001 |
ns |
|
|
1.00 |
|
0.013 |
| Vocational |
0.33 |
0.17–0.65 |
|
ns |
|
|
0.51 |
0.30–0.87 |
|
|
Alcohol/drug use |
|
|
|
|
|
|
|
|
|
| Low |
ns |
|
|
1.00 |
|
0.039 |
ns |
|
|
| Medium |
ns |
|
|
0.75 |
0.22 to 2.58 |
|
ns |
|
|
| High |
ns |
|
|
0.26 |
0.08 to 0.91 |
|
ns |
|
|
|
Sexual behaviour |
|
|
|
|
|
|
|
|
|
| Age first intercourse |
|
|
|
|
|
|
|
|
|
| ≥15 years |
ns |
|
|
1.00 |
|
0.001 |
1.00 |
|
0.029 |
| ≤14 years |
ns |
|
|
0.23 |
0.10–0.57 |
|
0.58 |
0.35–0.95 |
|
| Condom use first intercourse |
|
|
|
|
|
|
|
|
|
| Yes |
1.00 |
|
0.010 |
ns |
|
|
1.00 |
|
0.026 |
| No3 |
0.42 |
0.21–0.82 |
|
ns |
|
|
0.57 |
0.35–0.94 |
|
| Condom use last intercourse |
|
|
|
|
|
|
|
|
|
| Yes |
ns |
|
|
1.00 |
|
0.003 |
ns |
|
|
| No4 |
ns |
|
|
3.86 |
1.59–9.41 |
|
ns |
|
|
|
Chlamydia infection |
|
|
|
|
|
|
|
|
|
| Urogenital symptoms5 |
|
|
|
|
|
|
|
|
|
| No |
1.00 |
|
<0.001 |
ns |
|
|
1.00 |
|
0.001 |
| Yes | 4.26 | 1.89–9.63 | ns | 3.23 | 1.57–6.65 |
Age and gender (if applicable) included in the model.
OR, odds ratio; CI, confidence interval; NA, not applicable; ns non-significant, 1p-value for equality between categories; 2Reference group: boys; 3Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10); 4Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8); 5In girls: dysuri, vaginal discharge, intermenstrual and/or postcoital bleeding. In boys: dysuri and/or urethral discharge.