Factors associated with Chlamydia trachomatis testing in a high school based screening and previously in clinical practice: a cross-sectional study in Norway

Table 2 Odds ratios for clinic based testing in multivariable logistic regression models

		Girls			Boys			All participants¹
Characteristic	OR	95% CI	p ²	OR	95% CI	p ²	OR	95% CI	p ²
Gender: girls vs boys ³
Norwegian	NA			NA			7.96	5.26–12.04	< 0.001
Sami/Sami-Norwegian	NA			NA			3.62	1.92–6.82	< 0.001
Other	NA			NA			1.89	0.66–5.45	0.24
Age
OR per year	1.47	1.20–1.81	< 0.001	1.73	1.28–2.32	< 0.001	1.54	1.30–1.83	< 0.001
Family and culture
Ethnicity girls⁴
Norwegian	ns			NA			1.00		0.37
Sami/Sami-Norwegian	ns			NA			1.30	0.82–2.08
Other	ns			NA			0.78	0.38–1.60
Ethnicity boys⁵
Norwegian	NA			1.00		< 0.001	1.00		< 0.001
Sami/Sami-Norwegian	NA			2.83	1.56–5.13		2.86	1.59–5.14
Other	NA			3.53	1.44–8.64		3.28	1.37–7.84
Sexual behaviour
Age at first intercourse
≥15 years	1.00		0.006	1.00		0.003	1.00		< 0.001
≤14 years	1.78	1.18–2.67		2.56	1.39–4.71		2.02	1.43–2.85
Condom use first intercourse
Yes	ns			ns			1.00		0.013
No⁶	ns			ns			1.48	1.09–2.01
Currently in a relationship
Yes	ns			ns			1.00		0.009
No	ns			ns			0.66	0.49–0.90
Lifetime no of sex partners
1-2	1.00		< 0.001	1.00		< 0.001	1.00		< 0.001
3-5	2.42	1.59–3.71		4.22	1.95–9.12		3.07	2.11–4.46
≥6	6.31	3.85–10.34		8.57	3.91–18.79		7.63	5.03–11.55
Condom use last intercourse
Yes	1.00		0.011	ns			ns
No⁷	1.93	1.16–3.20		ns			ns

The significant variables from stepwise selection, age and gender (if applicable) were included in the models.
OR, odds ratio; CI, confidence interval; NA, not applicable; ns, non-significant; ¹Interaction term between gender and ethnicity included in the model (p 0.012); ² p-value for equality between categories; ³Reference group: boys; ⁴Odds ratios in girls; ⁵Odds ratios in boys; ⁶Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10); ⁷Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8).

ISSN: 1471-2334