Table 2.

Risk factor analysis for being CT positive^a.

			Univariate analysis			Multivariate analysisc
Characteristic	No. of participants	No. (%) with CTb	OR	95%CI	P-value	OR	95%CI	P-value
Age	709	51 (7.2)	0.94	0.89–0.99	0.01	0.95	0.90–1.00	0.06
Clinic
1	387	34 (8.8)	1			1
2	92	3 (3.3)	0.35	0.11–1.17	0.09	0.36	0.10–1.29	0.12
3	72	2 (2.8)	0.30	0.07–1.26	0.10	0.31	0.07–1.43	0.13
4	158	12 (7.6)	0.85	0.43–1.69	0.65	0.47	0.20–1.07	0.07
Contact of a CT positive
No	617	26 (4.2)	1			1
Yes	48	21 (43.8)	17.68	8.85–35.33	< 0.001	17.33	8.28–36.27	< 0.001
Not known	44	4 (9.1)	2.27	0.76–6.83	0.14	2.94	0.91–9.45	0.07
Taken CT-active medication in last 6 weeks
No	669	47 (7.0)	1
Yes	40	4 (10.0)	1.47	0.50–4.31	0.48
Symptomatic
No	591	38 (6.4)	1
Yes	118	13 (11.0)	1.8	0.93–3.50	0.08
STI last year
No	641	41 (6.4)	1			1
Yes	68	10 (14.7)	2.52	1.20–5.30	0.01	2.09	0.87–4.99	0.10
Currently menstruating
No	634	46 (7.3)	1
Yes	71	4 (5.6)	0.76	0.27–2.19	0.62
Has sex withd
Men	665	47 (7.1)	1
Women	20	1 (5.0)	0.70	0.09–5.28	0.72
Both	23	3 (13.0)	1.98	0.57–6.88	0.29

CT, Chlamydia trachomatis; OR, Odds ratio; 95% CI, 95% Confidence Interval; STI, Sexually transmitted infection.

^aFor each characteristic the number of participants and the proportion of these with a CT infection are shown.

^bCT positive defined as reference standard: either positive initial comparator test result (when in agreement with io® CT assay result); or positive by at least two of three of the initial comparator test, io® CT assay and, Artus CT assay).

^cAdjusted for age, clinic, contact status and STI in the last year (age and clinic considered a priori risk factors and included in all models).

^dSexual orientation unknown for one participant.