Table 2.

HIV incidence among men who have sex with men retained in our cohort in Shenyang (N=461).

Characteristics		Total (N=461a)	Incidence, n (%)	Observed person-years (PY)	Incidence rate (per 100 PY)
						Age of sexual debut (years)
	≤20	205	9 (4.4)	153.1	5.9
	>20	256	10 (3.9)	181.5	5.5
Ever had sexual intercourse with females
	Yes	246	7 (2.8)	177.2	4.0
	No	215	12 (5.6)	157.4	7.6
Anal sex position
	Versatile	208	7 (3.4)	162.3	4.3
	Bottom	168	6 (3.6)	118.1	5.1
	Top	85	6 (7.1)	54.2	11.1
Ever been tested for HIV
	Yes	95	5 (5.3)	63.9	7.8
	No	366	14 (3.8)	270.7	5.2
Used recreational drugs in the past 3 months
	Yes	141	10 (7.1)	75.3	13.3
	No	320	9 (2.8)	259.3	3.5
Number of male steady partners in the past 3 months
	≥2	51	0 (0.0)	39.4	0.0
	<2	410	19 (4.6)	295.2	6.4
Number of male casual partners in the past 3 months
	≥5	43	3 (7.0)	31.9	9.4
	<5	418	16 (3.8)	302.7	5.3
Condomless anal intercourse with male casual partners in the past 3 months
	Yes	77	7 (9.1)	55.4	12.6
	No	384	12 (3.1)	279.2	4.3
Condomless anal intercourse with male steady partners in the past 3 months
	Yes	120	2 (1.7)	89.2	2.2
	No	341	17 (5.0)	245.5	6.9
Had group sex with males in the past 3 months
	Yes	31	4 (12.9)	28.6	14.0
	No	430	15 (3.5)	306.1	4.9
Positive for syphilis at baseline
	Yes	59	3 (5.1)	47.0	6.4
	No	402	16 (4.0)	287.6	5.6
Ever used geosocial networking apps to seek male sexual partners (ie, GSN-apps’ users vs nonusers)
	Yes	264	16 (6.1)	187.3	8.5
	No	197	3 (1.5)	147.3	2.0
Used geosocial networking apps to seek male sexual partners in the past 3 months
	Yes	239	14 (5.9)	175.5	8.0
	No	222	5 (2.3)	159.2	3.1

^aThe number of GSN apps’ users and nonusers retained to at least one 3-month follow-up visit.