Table 3.

Correlates of annual testing for chlamydia/gonorrhoea among participants attending selected clinics of the OHTN Cohort Study

	Person years of observation*	Per cent tested	Unadjusted OR (95% CI)	Adjusted OR (95% CI)
Each additional calendar year			1.20 (1.14 to 1.25)	1.27 (1.17 to 1.39)
Sex
Male: MSM	5722	28.5	Referent	Referent
Male: non-MSM	898	7.1	0.19 (0.14 to 0.27)	0.47 (0.35 to 0.64)
Female	1289	17.6	0.54 (0.44 to 0.67)	0.91 (0.73 to 1.14)
Age (years)
<30	320	40.0	Referent
30–39	1209	33.3	0.76 (0.56 to 1.03)
40–49	3309	25.4	0.54 (0.40 to 0.72)
50+	3218	17.3	0.36 (0.26 to 0.48)
Each additional decade			0.68 (0.63 to 0.73)	0.72 (0.67 to 0.77)
Region
Other	1208	3.9	Referent	Referent
Toronto	6848	27.5	9.38 (6.71 to 13.1)	2.27 (1.61 to 3.19)
Viral load tests in calendar year
1 test	705	15.6	Referent	Referent
2–3 tests	4015	21.9	1.39 (1.16 to 1.68)	1.65 (1.25 to 2.15)
4 or more tests	3172	29.3	1.83 (1.51 to 2.21)	2.72 (2.07 to 3.59)
Clinic type
Tertiary	4748	9.7	Referent	Referent
Primary	3308	44.4	7.35 (6.31 to 8.56)	3.81 (3.24 to 4.48)
Tested for chlamydia/gonorrhoea in previous year
No	5799	13.4	Referent	Referent
Yes: non-reactive	1392	59.9	26.4 (22.6 to 30.9)	7.03 (5.92 to 8.34)
Yes: reactive	106	75.5	47.6 (25.3 to 89.4)	15.6 (9.04 to 27.0)

Multiple logistic regression with generalised estimating equations. Each person year was modelled as a unique observation (n=8056 person-years among 2854 participants). We excluded the year 2008 and any participant with less than two years of prospective follow-up to allow for estimation of the effect of having tested in the previous calendar year. See text for details.

*The sum total of years that participants were under observation.

MSM, men who have sex with men.