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Table 2 Baseline characteristics of the 270 female sex workers recruited into the follow-up cohort study, stratified by whether or not they moved to a different city during the study.

From: Mobility, risk behavior and HIV/STI rates among female sex workers in Kaiyuan City, Yunnan Province, China

  Characteristic Cohort members who moved
(N = 117)
Number (%)
Cohort members who did not move (N = 153)
Number (%)
Mobility incidence (/100 person months) Univariate analysis
Hazard Risk (95% Confidence Interval)
Multivariate analysis
Hazard Risk (95% Confidence Interval)
Age (years) 16-20 35 (29.9) 41 (26.8) 5.75 1.0  
  21-25 42 (35.9) 42 (27.4) 6.00 1.04 (0.66-1.63) 0.95 (0.61-1.50)
  26-52 40 (34.2) 70 (45.8) 4.13 0.72 (0.46-1.13) 0.63 (0.38-1.04)
Nationality Han 83 (70.9) 107 (69.9) 5.17 1.0  
  Other 34 (29.1) 46 (30.1) 5.06 0.98 (0.66-1.46)  
Registered Kaiyuan city 39 (33.3) 84 (54.9) 3.67 1.0  
permanent Other cities in Yunnan 53 (45.3) 47 (30.7) 6.47 1.74 (1.15-2.63) 1.67 (1.09-2.56)
residence Outside Yunnan 25 (21.4) 22 (14.4) 6.33 1.70 (1.03-2.81) 1.58 (1.04-2.54)
Education level < 9 years 55 (47.0) 78 (51.0) 4.84 1.0  
  ≥9 years 62 (53.0) 75 (49.0) 5.44 1.13 (0.78-1.62)  
Marital status Married or cohabitation 37 (31.6) 48 (31.4) 5.14 1.0  
  Single, separated, divorced, or widowed 80 (68.4) 105 (68.6) 5.13 0.99 (0.67-1.46)  
Earnings per sex ≤$7 14 (12.0) 30 (19.6) 3.77 1.0  
  $7~$14 49 (41.9) 79 (51.6) 4.36 1.15 (0.64-2.09)  
  > $14 54 (46.1) 44 (28.8) 6.89 1.79 (1.00-3.23)  
Drug use (ever) Non-drug user 97 (82.9) 110 (71.9) 5.44 1.0  
  Non-injection illegal drug user 11 (9.4) 11 (7.2) 6.20 1.12 (0.60-2.08) 1.34 (0.71-2.54)
  Injection drug user 9 (7.7) 32 (20.9) 2.84 0.52 (0.26-1.02) 0.72 (0.33-1.54)
HIV Negative 101 (86.3) 122 (79.7) 5.31 1.0  
  Positive 16 (13.7) 31 (20.3) 4.24 0.80 (0.47-1.36) 1.12 (0.63-1.99)
Any STIs Negative 26 (22.2) 22 (14.4) 6.55 1.0  
  Positive 91 (77.8) 131 (85.6) 4.84 0.73 (0.47-1.13)  
Duration of < 1 year 31 (26.5) 40 (26.1) 5.16 1.0  
commercial sex 1-2 years 53 (45.3) 59 (38.6) 5.70 1.10 (0.70-1.71)  
Work ≥3 years 33 (28.2) 54 (35.3) 4.42 0.85 (0.52-1.39)  
Entertainment venue Higher risk 35 (29.9) 72 (47.1) 3.77 1.0  
  Lower risk 82 (70.1) 81 (52.9) 6.07 1.59 (1.07-2.36) 1.55 (1.03-2.35)
  1. (HIV sero-positivity and drug users were added into the multivariate analysis model)