Table 1.
Prevalence of syphilis by demographic and behavioral characteristics and HIV infection (univariate analysis)
| Characteristics | Number* | Prevalence % (95%CI) |
P value | OR (95%CI) |
|---|---|---|---|---|
| Total | 7118 | 5.0 (4.5-5.5) | ||
| Age in years (median, interquartile range) | 24 (16-56) | < 0.001 | 1.08 (1.07, 1.10) | |
| Age group | < 0.001 | |||
| 16-19 | 1015 | 1.7 (1.0, 2.5) | 1.0 (Reference) | |
| 20-29 | 4197 | 4.0 (3.0, 4.6) | 2.42 (1.46, 4.00) | |
| 30-39 | 1519 | 7.8 (6.0, 9.2) | 4.98 (2.97, 8.33) | |
| 40- | 387 | 14.4 (11.0, 18.0) | 9.85 (5.63, 17.23) | |
| Province | < 0.001 | |||
| Jiangsu | 1791 | 3.6 (2.8-4.5) | 1.0 (Reference) | |
| Guangdong | 1361 | 4.0 (2.9-5.0) | 1.10 (0.76, 1.59) | |
| Guangxi | 2515 | 7.1 (6.1-8.1) | 2.03 (1.52, 2.72) | |
| Hainan | 1451 | 3.9 (2.9-4.9) | 1.10 (0.77, 1.59) | |
| Site city | < 0.001 | |||
| Yangzhou | 929 | 0.8 (0.2-1.3) | 1.0 (Reference) | |
| Changzhou | 862 | 6.7 (5.1-8.4) | 9.49 (4.31, 20.92) | |
| Jiangmen | 533 | 3.0 (1.6-4.6) | 4.07 (1.66, 9.95) | |
| Maoming | 828 | 4.6 (3.2-6.0) | 6.39 (2.84, 14.38) | |
| Wuzhou | 1706 | 4.7 (3.7-5.7) | 6.49 (2.99, 14.11) | |
| Hezhou | 809 | 12.2 (10.0-14.5) | 18.33 (8.46, 39.69) | |
| Qionghai | 643 | 4.4 (2.8-5.9) | 6.25 (2.71, 14.40) | |
| Sanya | 808 | 3.6 (2.3-4.9) | 4.89 (2.13, 11.23) | |
| Education | < 0.001 | |||
| Primary or less | 1140 | 9.4 (7.7-11.1) | 4.42 (2.91, 6.72) | |
| Junior high school | 4727 | 4.6 (4.0-5.2) | 2.04 (1.38, 3.02) | |
| Senior high school and above | 1243 | 2.3 (1.5-3.2) | 1.0 (Reference) | |
| Marital status | < 0.001 | |||
| Never married | 4262 | 3.5 (3.0-4.1) | 1.0 (Reference) | |
| Married | 2641 | 7.0 (6.0-8.0) | 2.08 (1.67, 2.59) | |
| Separated/divorced/widowed | 202 | 9.9 (5.8-14.0) | 3.03 (1.86,4.95) | |
| Ethnicity | 0.452 | |||
| Han | 6263 | 5.0 (4.5-5.5) | 1.0 (Reference) | |
| Minority | 827 | 5.6 (4.0-7.2) | 1.13(0.82, 1.55) | |
| Household registration(hukou) | 0.322 | |||
| Local | 1859 | 4.6 (3.7-5.6) | 1.0 (Reference) | |
| Not local | 5246 | 5.2 (4.6-5.8) | 1.13(0.88, 1.46) | |
| Typology | < 0.001 | |||
| High-tier | 2144 | 2.2 (1.6-2.9) | 1.0 (Reference) | |
| Middle-tier | 3227 | 4.3 (3.6-5.0) | 1.95 (1.40, 2.73) | |
| Low-tier | 1747 | 9.7 (8.3-11.1) | 4.76 (3.43, 6.60) | |
| Having had any STI symptoms past year | 0.658 | |||
| Yes | 2892 | 4.9 (4.1-5.7) | 0.95 (0.77, 1.18) | |
| No | 4200 | 5.1 (4.4-5.8) | 1.0 (Reference) | |
| Consistent condom use in past month | 0.254 | |||
| Yes | 3282 | 5.4 (4.7-6.2) | 1.14 (0.91,1.42) | |
| No | 3266 | 4.8 (4.0-5.5) | 1.0 (Reference) | |
| Injecting drug use | < 0.001 | |||
| Yes | 20 | 25.0 (6.0-44.0) | 6.39 (2.31, 17.69) | |
| No | 7063 | 4.9 (4.4-5.4) | 1.0 (Reference) | |
| HIV infection | 0.007 | |||
| Positive | 43 | 14.0 (3.6-24.3) | 3.11 (1.30, 7.41) | |
| Negative | 7059 | 4.9 (4.4-5.5) | 1.0 (Reference) |
*The sum of numbers in some subgroups was less than 7118 because some participants did not respond to some questions.
CI confidence interval, OR odds ratio.