Table 1.

Demographic Characteristics of the Participants (N=1304)

Variables	n	%
Source of samples (different regions)
Guangxi	556	42.6
Chongqing	408	31.3
Xinjiang	340	26.1
Ages
≤24	44	3.4
25–35	313	24
≥36	947	72.6
Ethnic group
Han	1,206	92.5
Other ethnicity	98	7.5
Marital status
Single	523	40.1
Married or cohabiting	604	46.3
Divorced/separated/widowed	177	13.6
Education level
Elementary school or below	222	17
Junior high school	682	52.3
Senior high school or above	398	30.5
Employment status
Not employed	731	56.1
Employed	573	43.9
Grades of AIDS knowledgea
Less than average grades	531	40.7
Average grades or more	773	59.3
Age at first taking drugs
≤19	491	37.7
20–30	543	41.6
≥31	179	13.7
Refused to answer	91	7
Received methadone maintenance therapy in the past year
Yes	1,025	78.6
No	279	21.4
Received AIDS advice or detection from authorities in the past year
Yes	953	73.1
No	351	26.9
Received educational materials on AIDS or sexually transmitted diseases (STD) in the past year
Yes	792	60.7
No	512	39.3
Received peer education on AIDS in the past year
Yes	327	25.1
No	977	74.9
Received any free condoms from authorities in the past year
Yes	255	19.6
No	1,049	80.4
Exchanged needles or received clean needles from the Needle Exchange Center in the past year
Yes	211	16.2
No	1,093	83.8
Ever had sexual intercourse (n=1304)
Yes	1,275	97.8
No	29	2.2
Frequency of having sex with spouse or cohabitant in the past year (n=780)b
One time or above every week	388	49.7
Less than one time every week	282	36.2
Never	84	10.8
Refused to answer	26	3.3
Frequency of using condoms when having sex with spouse or cohabitant in the past year (n=685)b
Never	368	53.7
Sometimes	206	30.1
Always	111	16.2
Ever had sex with casual partners in the past year (n=1,262)b
Yes	322	24.7
No	940	72.1
Frequency of sexual intercourse with casual partners in the past year (n=335)b
1	161	12.3
2	64	4.9
≥3	83	6.4
Refused to answer	27	2.1
Frequency of using condoms when having sex with your casual partners in the past year (n=328)b
Never	112	34.1
Sometimes	97	29.6
Always	119	36.3
Ever received commercial sexual services by paying or giving drugs in the past year (n=1,275)b
Yes	189	14.8
No	1,075	82.4
Refused to answer	11	0.8
Frequency of commercial sexual services by paying or giving drugs in the past year (n=200)b
1	71	5.4
2	46	3.5
≥3	59	4.5
Refused to answer	24	1.8
Frequency of using condoms when having sex with commercial sexual partners in the past year (n=200)b
Never	44	22.0
Sometimes	41	20.5
Always	109	54.5
Refused to answer	6	3.0
Ever had sex with the same gender as yours in the past year (n=1,275)
Yes	15	1.2
No	1,255	96.2
Refused to answer	5	0.4
Had symptoms of urogenital infection, such as painful urination in the past year (n=1,304)
Yes	149	11.4
No	1,149	88.1
Refused to answer	6	0.5

^aTen items in the questionnaire were designed to assess knowledge about AIDS, with each correct answer given a point, and the total score was calculated after all 10 items were done. The average score for all interviewed subjects is 9.3.

^bThe numbers are different as some did not answer the question.