Table 1.

Sociodemographic Characteristics of 631 participants at baseline

Variable	Total		SMS		Control		t/χ 2	P
	N	%	N	%	N	%
Age	32.36 ± 8.46		32.93 ± 8.53		31.78 ± 8.35		1.716	0.087
18–24	96	15.21	44	13.88	52	16.56	1.129	0.569
25–49	507	80.35	260	82.02	247	78.66
≥ 50	28	4.44	13	4.10	15	4.78
Native place (province)
Jiangsu	225	36.66	111	35.02	114	36.31	5.166	0.160
Others	406	64.34	206	64.98	200	63.69
Marital status with female
In marriage	227	35.97	114	35.96	113	35.99	3.315	0.191
Unmarried	365	57.85	178	56.15	187	59.55
Other	39	6.18	25	7.89	14	4.46
Occupation
Students	26	4.12	10	3.15	16	5.10	1.553	0.460
Service personnel/Freelancer	358	56.74	183	57.73	175	55.73
Personnel of enterprises and institutions/Others	247	39.14	124	39.12	123	39.17
Education
College or above	279	44.22	138	43.53	141	44.90	0.584	0.747
High school	230	36.45	120	37.85	110	35.03
Junior high or below	122	19.33	59	18.61	63	20.06
Self-reported sexual orientation
Homosexual	425	67.35	217	68.46	208	66.24	2.105	0.349
Heterosexual	13	2.06	4	1.26	9	2.87
Bisexual/Uncertain	193	30.59	96	30.28	97	30.89
Age of first homosexual intercourse
	20.96 ± 4.61		20.70 ± 4.31		21.21 ± 4.89		-1.399	0.162
Anal sex role
Only 0	213	33.76	106	33.44	107	34.08	3.465	0.177
Only 1	215	34.07	118	37.22	97	30.89
0 and/or 1	203	32.17	93	29.34	110	35.03
HIV tested in last year
Yes	509	80.67	258	81.39	251	79.94	0.213	0.644
No	122	19.33	59	18.61	63	20.06
Willing to take the HIV test voluntarily
Yes	583	92.39	290	91.48	293	93.31	0.822	0.663
No	10	1.58	6	1.89	4	1.27
Unclear	38	6.02	21	6.62	17	5.41