Table 1.
Comparison of demographic and behavioral characteristics of FSWs in cohort and lost to follow-up
| Demographic and behavioral characteristics | Lost to follow up (N=1096) |
At least one follow up (N=792) |
P | |
|---|---|---|---|---|
| Age (years) | 16–20 | 387 (35.3) | 224 (28.3) | <.0001 |
| 21–25 | 306 (27.9) | 196 (24.7) | ||
| 26–52 | 403 (36.8) | 372 (47.0) | ||
| Ethnicity | Han | 752 (68.6) | 555 (70.1) | 0.4968 |
| Other | 344 (31.4) | 237 (29.9) | ||
| Place of registered permanent residence | Local city | 272 (24.8) | 214 (27.0) | 0.0424 |
| Other cities in Yunnan | 645 (58.9) | 422 (53.3) | ||
| Outside Yunnan | 179 (16.3) | 156 (19.7) | ||
| Education level | ≤6 years | 395 (36.0) | 276 (34.8) | 0.5934 |
| >6 years | 701 (64.0) | 516 (65.2) | ||
| Marital status | Married or cohabitation | 332 (30.3) | 244 (30.8) | 0.8101 |
| Single, separated, divorced, or widowed | 764 (69.7) | 548 (69.2) | ||
| Commercial sex venue | Lower risk | 636 (58.0) | 484 (61.1) | 0.1785 |
| Higher risk | 460 (42.0) | 308 (38.9) | ||
| Residence type | Apartment | 637 (58.1) | 551 (69.6) | <.0001 |
| Family home | 108 (9.9) | 101 (12.7) | ||
| Brothel or other working location | 351 (32.0) | 140 (17.7) | ||
| Drug use (ever) | Injection drug user | 97 (8.8) | 113 (14.3) | 0.0003 |
| Non-injection illegal drug user | 62 (5.7) | 56 (7.1) | ||
| Non-drug user | 937 (85.5) | 623 (78.6) | ||
| Drinks alcohol | No | 411 (37.5) | 254 (32.1) | 0.0148 |
| Yes | 685 (62.5) | 538 (67.9) | ||
| Duration of commercial sex work (years) | <2 | 721 (65.8) | 437 (55.2) | <.0001 |
| 2–5 | 226 (20.6) | 188 (23.7) | ||
| ≥5 | 149 (13.6) | 167 (21.1) | ||
| Age at sexual debut | <18 | 447 (40.8) | 309 (39.0) | 0.4387 |
| ≥18 | 649 (59.2) | 483 (61.0) | ||
| Age at initiation of commercial sex work | <20 | 392 (35.8) | 257 (32.4) | 0.1343 |
| ≥20 | 704 (64.2) | 535 (67.6) | ||
| Number of clients in previous week | <7 | 829 (75.6) | 647 (81.7) | 0.0017 |
| ≥7 | 267 (24.4) | 145 (18.3) | ||
| Always used condom with clients in previous week | Yes | 917 (83.7) | 671 (84.7) | 0.5363 |
| No | 179 (16.3) | 121 (15.3) | ||
| Has regular sexual partner | No | 547 (49.9) | 383 (48.4) | 0.5061 |
| Yes | 549 (50.1) | 409 (51.6) | ||
| Always used condom with regular partner in previous week | Yes | 91 (16.6) | 82 (20.1) | 0.1669 |
| No | 458 (83.4) | 327 (79.9) | ||
| Fee-per-service | ≥$16 | 679 (61.9) | 527 (66.5) | 0.0406 |
| <$16 | 417 (38.1) | 265 (33.5) | ||
| Vaginal douching | No | 233 (21.3) | 148 (18.7) | 0.1694 |
| Yes | 863 (78.7) | 644 (81.3) | ||
| HIV sero-positivity | No | 1001 (91.3) | 702 (88.6) | 0.0519 |
| Yes | 95 (8.7) | 90 (11.4) | ||
| HSV-2 sero-positivity | No | 434 (39.6) | 265 (33.5) | 0.0064 |
| Yes | 662 (60.4) | 527 (66.5) | ||
| C. trachomatis positive | No | 851 (77.6) | 643 (81.2) | 0.0617 |
| Yes | 245 (22.4) | 149 (18.8) | ||
| T. vaginalis positive | No | 1023 (93.3) | 720 (90.9) | 0.0503 |
| Yes | 73 (6.7) | 72 (9.1) | ||
| Syphilis positive | No | 1044 (95.3) | 731 (92.3) | 0.0075 |
| Yes | 52 (4.7) | 61 (7.7) | ||