Table 2

Bivariate associations of PrEP use, CAS, oral sex (OS) and number of anal sex partners (NSPs) and any recent bacterial STI diagnosis; baseline data, Engage cohort study (n=2009)

Predictor	Outcome	Direct effect
Predictor	Outcome	β	95% CI	P value
PrEP use	STI	0.14	0.03 to 0.24	0.01
OS	STI	0.23	0.10 to 0.36	<0.001
CAS	STI	0.38	0.27 to 0.48	<0.001
PrEP use	OS	0.07	−0.16 to 0.29	0.56
NSPs	OS	0.19	−0.12 to 0.49	0.24
PrEP use	CAS	0.28	0.17 to 0.38	<0.001
NSPs	CAS	0.68	0.64 to 0.72	<0.001
PrEP use	NSPs	0.30	0.23 to 0.37	<0.001

The estimated coefficients are standardised coefficients.
CAS, condomless anal sex; PrEP, pre-exposure prophylaxis.