Table 3. Correlation between gay app use features and group sex among Chinese MSM gay app users, 2014 (N = 824).

		Group sex	No group sex (n2)	Crude OR	95% CI	Adjusted OR€	95% CI
Time started to use gay app	< 6 months	19	118	0.66	0.33,1.34	0.93	0.44,1.97
	6–12 months	19	178	0.44	0.22,0.88	0.63	0.30,1.31
	1–3 years	34	364	0.38	0.21,0.72	0.49	0.26,0.93
	> 3 years	18	74	Ref		Ref
Number of sex partners found through a gay app in the last 6 months	1	9	215	Ref		Ref
	2 to 3	22	312	1.68	0.76,3.73	1.61	0.71,3.64
	4 to 6	15	107	3.35	1.42,7.90	3.01	1.24,7.30
	Above six	44	100	10.51	4.94,22.37	11.44	5.21,25.13
Number of receptive anal sex acts with partners met through a gay app in the last six months	0 to 5	48	581	Ref		Ref
	6 to 10	17	90	2.29	1.26,4.15	2.70	1.44,5.06
	11 to 20	12	33	4.40	2.14,9.08	5.02	2.34,10.77
	Above 20	13	30	5.25	2.57,10.72	5.76	2.66,12.47
Number of insertive anal sex acts with partners met through a gay app in the last six months	0 to 5	35	589	Ref		Ref
	6 to 10	19	109	2.88	1.59,5.23	2.57	1.39,4.75
	11 to 20	16	28	9.45	4.68,19.09	7.70	3.69,16.09
	Above 20	20	18	18.38	8.92,37.85	16.24	7.53,34.98
Time duration between met the last sex partner through a gay app and met in person	< 1 hour	10	65	1.72	0.75,3.94	1.46	0.66,3.22
	1–24 hours	37	188	2.20	1.20,4.04	0.68	0.30,1.53
	2–7 days	26	291	1.00	0.43,1.89	0.62	0.26,1.48
	>1 week	17	190	Ref		Ref
Place had sex with the last gay app partner	Home	29	346	Ref		Ref
	Hotel or venues	61	388	1.59	1.00,2.53	1.48	0.91,2.42
Used condom during sex with last gay app partner	Yes	58	469	Ref
	No	26	153	1.37	0.84, 2.26	1.45	0.86, 2.44
Negotiated about condom use with the last gay app partner before met in person	Yes	55	431	Ref		Ref
	No	35	303	0.90	0.58,1.42	0.94	0.59,1.50
Asked for HIV status of the last gay app partner before met	No	50	500	Ref		Ref
	Yes	40	234	1.71	1.10,2.66	1.64	1.03,2.60

€ Model adjusted for age, residence, education, marital status and income.