Table 3.

Slopes of average change in a given risky sexual behaviour over follow-up and rate ratio for every 4 or 12 (for STIs) weeks increase in follow-up

STIs	Coefficient (slope) (95% CI)	Rate ratio	P value
Any STI	−0.15 (−0.19 to −0.11)	0.86 (0.83–0.90)	<0.001
Chlamydia trachomatis	−0.07 (−0.14 to 0.004)	0.93 (0.87–1.01)	0.066
Trichomonas vaginalis	−0.22 (−0.27 to −0.16)	0.81 (0.76–0.85)	<0.001
Neisseria gonorrhoeae	−0.16 (−0.27 to −0.06)	0.85 (0.77–0.94)	0.002
Sexual behaviour (self-reported)
Condom use at last sex act	−0.002 (−0.03 to 0.03)	0.99 (0.97–1.03)	0.896
Having two or more sexual partners	−0.02 (−0.04 to 0.008)	0.98 (0.97–1.001)	0.06
Non condom use over time	−0.03 (−0.07 to 0.01)	0.97 (0.94–1.01)	0.177