Table 3 Categorization of the 966 questionnaire respondents from stage 2 (n = 966)

Screening history (n = 955)

Never screened before

452 (47.3)

83.4 (377/452)

Previously screened

503 (52.7)

87.1 (438/503)

Health insurance (n = 966)

With insurance

876 (90.7)

86.2 (755/876)

Without insurance

90 (9.3)

74.4 (67/90)^*

Education (n = 963)

Less than middle school

45 (4.7)

86.7 (39/45)

Middle school

214 (22.2)

84.6 (181/214)

College degrees

704 (73.1)

85.2 (600/704)

Monthly family income (n = 954)

Less than 5000 yuan

191 (20.0)

88.5 (169/191)

5000 to 10,000 yuan

541 (56.7)

89.8 (486/541)

10,000 yuan or more

222 (23.3)

72.1 (160/222)^*

Age of first sex

(n = 929)

 < 20 years

180 (19.4)

84.4 (152/180)

 ≥ 20 years^*

749 (80.6)

84.8 (635/749)

Number of sexual partners (n = 875)

1

842 (96.2)

85.7 (722/842)

 ≥ 2

33 (3.8)

78.8 (26/33)

Smoking

(n = 927)

Yes

16 (1.7)

81.3 (13/16)

No

911 (98.2)

84.6 (771/911)