Table 1. Socio-demographic characters and behaviors among Chinese MSM who engaged and not engaged in group sex, 2014 (n = 1424).

Variables		Group sex			Non-group sex			Total
		Frequency	Percent	95% CI	Frequency	Percent	95% CI	Frequency	Percent
Age (years)	Less than 20	13	9.2	4.4,14.0	193	15	13.1,17.0	206	14.5
	20 to 29	81	57.4	49.2, 65.7	817	63.7	61.0,66.3	898	63.1
	30 or above	47	33.3	25.5,41.2	273	21.3	19.0,23.5	320	22.5
Education	High school or less	29	20.6	13.8,27.3	340	26.5	24.1,28.9	369	25.9
	College / Bachelors	94	66.7	58.8,74.5	875	68.2	65.6,70.8	969	68.1
	Masters or PhD	18	12.8	7.2,18.3	68	5.3	4.1,6.5	86	6
Student	Yes	45	31.9	24.1,39.7	543	42.3	39.6,45.0	588	41.3
	No	96	68.1	60.3,75.9	740	57.7	55.0,60.4	836	58.7
Marital Status	Never married	99	70.2	62.6,77.8	1095	85.3	83.4,87.3	1194	83.9
	Ever Married	42	29.8	22.2,37.4	188	14.7	12.7,16.6	230	16.1
Annual income (USD)	<3000	22	15.6	9.5,21.7	348	27.1	24.7,29.6	370	26
	3000–6000	31	22	15.1,28.9	389	30.3	27.8,32.8	420	29.5
	6001–9600	42	29.8	22.2,37.4	334	26	23.6,28.4	376	26.4
	9601–15,000	28	19.9	13.2,26.5	143	11.1	9.4,12.9	171	12
	>15,000	18	12.8	7.2,18.3	69	5.4	4.1,6.6	87	6.1
Residence*	Urban	129	91.5	86.8,96.2	1137	88.6	86.9,90.4	1266	88.9
	Rural	12	8.5	3.8,13.2	146	11.4	9.6,13.1	158	11.1
Gay app users¶	Yes	90	63.8	55.8,71.9	734	57.2	54.5,59.9	824	57.9
	No	51	36.2	28.1,44.2	549	42.8	40.1,45.5	600	42.1
Sexual Orientation	Gay	94	66.7	58.8,74.5	944	73.6	71.2,76.0	1038	72.9
	Bisexual	47	33.3	25.5,41.2	339	26.4	24.0,28.8	386	27.1
Sexual orientation disclosure	Yes	11	7.8	3.3,12.3	57	4.4	3.3,5.6	68	4.8
	No	130	92.2	87.7,96.7	1226	95.6	94.4,96.7	1356	95.2
Transgender Ф	Yes	16	11.3	6.0,16.6	45	3.5	2.5,4.5	61	4.3
	No	125	88.7	83.4,94.0	1238	96.5	95.5,97.5	1363	95.7
Currently have a main partner	Yes	91	64.5	56.6,72.5	600	46.8	44.0,49.5	691	48.5
	No	50	35.5	27.5,43.4	683	53.2	50.5,56.0	733	51.5
Main sexual role during anal sex	Insertive	72	51.1	42.7,59.4	452	35.2	32.6,37.8	524	36.8
	Acceptive	50	35.5	27.5,43.4	571	44.5	41.8,47.2	621	43.6
	No preference	19	13.5	7.8,19.2	260	20.3	18.1,22.5	279	19.6
Ever had vaginal or oral sex with women	Yes	80	56.7	48.5,65.0	334	26	23.6,28.4	414	29.1
	No	61	43.3	35.0,51.5	949	74	71.6,76.4	1010	70.9
Had condomless sex with women in the last 3 months	Yes	51	63.8	53.0,74.5	131	39.2	34.0,44.5	182	44
	No	29	36.3	25.5,47.0	203	60.8	55.5,66.0	232	56
Changed sex for gift/money in the last 12 months	Yes	35	24.8	17.6,32.0	47	3.7	2.6,4.7	82	5.8
	No	106	75.2	68.0,82.4	1236	96.3	95.3,97.4	1342	94.2
Intimate partner abuse†	Yes	104	73.8	66.4,81.1	676	52.7	50.0,55.4	780	54.8
	No	37	26.2	18.9,33.6	607	47.3	44.6,50.0	644	45.2
Had condomless sex with men in the last three months	Yes	66	46.8	38.5,55.2	937	73	70.6,75.5	1003	70.4
	No	75	53.2	44.8,61.5	346	27	24.5,29.4	421	29.6
Ever tested for HIV	Yes	91	64.5	56.6,72.5	612	47.7	45.0,50.4	703	49.4
	No	50	35.5	27.5,43.4	671	52.3	49.6,55.0	721	50.6
Ever tested for other STIs except HIV	Yes	75	53.2	44.8,61.5	381	29.7	27.3,32.2	456	32
	No	66	46.8	38.5,55.2	902	70.3	67.8,72.8	968	68

* Residence: the place the participants mainly live in during the survey time

^¶ Gay app users: If participants reported any use of gay apps to find sex partners in the last six months, they were categorized as gay app users, while others were categorized as non-users

^Ф Transgender: Participants who have gender identities, expressions, or behaviors not traditionally associated with their birth sex

^†Intimate partner: The term “intimate partner” includes current or former spouses, spouses in the process of separating, and dating partners.