Table 1 Social-demographic characteristics of participants
Characteristics | Case number (%) | Â | |
|---|---|---|---|
2013 | 2015 | P-value | |
Age (years) | Â | Â | 0.001 |
 2–14 | 0 (0.0%) | 0 (0.0%) |  |
 15–19 | 1 (0.4%) | 8 (3.2%) |  |
 20–25 | 36 (14.4%) | 52 (20.8%) |  |
 26–29 | 41 (16.4%) | 63 (25.2%) |  |
 30–34 | 65 (26.0%) | 44 (17.6%) |  |
 35–39 | 40 (16.0%) | 22 (8.8%) |  |
 40–49 | 48 (19.2%) | 41 (16.4%) |  |
  ≥ 50 | 18 (7.2%) | 20 (8.0%) |  |
 Unknown | 1 (0.4%) | 0 (0.0%) |  |
Gender |  |  | > 0.05 |
 Male | 222 (88.8%) | 221 (88.4%) |  |
 Female | 27 (10.8%) | 29 (11.6%) |  |
 Unknown | 1 (0.4%) | 0 (0.0%) |  |
Ethnic |  |  | > 0.05 |
 Han ethnic | 241 (96.4%) | 234 (93.6%) |  |
 Minor ethnic | 9 (3.6%) | 16 (6.4%) |  |
Marital status | Â | Â | 0.002 |
 Single | 139 (55.6%) | 161 (64.4%) |  |
 Married | 88 (35.2%) | 53 (21.2%) |  |
 Divorced, separated or widowed | 23 (9.2%) | 33 (13.2%) |  |
 Unknown | 0 (0%) | 3 (1.2%) |  |
Education |  |  | > 0.05 |
 College or higher | 59 (23.6%) | 76 (30.4%) |  |
 Senior high school | 77 (30.8%) | 62 (24.8%) |  |
 Junior high school | 92 (36.8%) | 93 (37.2%) |  |
 Primary school or lower | 22 (8.8%) | 19 (7.6%) |  |
Occupation |  |  | > 0.05a |
 Catering services | 6 (2.4%) | 3 (1.2%) |  |
 Official | 7 (2.8%) | 7 (2.8%) |  |
 Worker | 70 (28%) | 65 (26%) |  |
 Commercial service | 61 (24.4%) | 69 (27.6%) |  |
 Unemployed | 61 (24.4%) | 78 (31.2%) |  |
 Retired | 3 (1.2%) | 3 (1.2%) |  |
 Migrant laborer | 2 (0.8%) | 4 (1.6%) |  |
 Student | 1 (1.6%) | 2 (0.8%) |  |
 Others | 4 (0.4%) | 12 (4.8%) |  |
 Unknown | 35 (14.0%) | 7 (2.8%) |  |
Route of transmission | Â | Â | 0.017 |
 Heterosexual | 133 (53.2%) | 112 (44.8%) |  |
 MSM | 101 (40.4%) | 130 (52.0%) |  |
 IDU | 12 (4.8%) | 4 (1.6%) |  |
 Blood-borne | 1 (0.4%) | 1 (0.4%) |  |
 Unknown | 3 (1.2%) | 3 (1.2%) |  |