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Table 2 Unadjusted and adjusted hazard ratios for women lost to follow up in the study.

From: Maximising retention in a longitudinal study of genital Chlamydia trachomatis among young women in Australia

Characteristic Total number of women (n) Number (%) lost to follow up Hazard Ratios (95% CI)a Adjusted Hazard Ratios b (95% CI)
Clinic type     
GPc 738 140 (19.0) 1 1
SHSd 378 99 (26.2) 1.5 (0.9, 2.4) 1.6 (1.0, 2.7)
Clinic location     
Rural 455 88 (19.3) 1 1
Metro 661 151 (22.8) 1.2 (0.7, 2.2) 1.4 (0.8, 2.4)
Age group     
< 21 years old 452 100 (22.1) 1 1
> 20 years old 664 139 (20.9) 0.9 (0.6,1.3) 1.0 (0.7, 1.3)
Education level achieved     
Up to year 12 609 140 (23.0) 1 1
Tertiary 477 85 (17.8) 0.7 (0.5, 1.0) 0.7 (0.5, 1.0)
Employment status     
Unemployed/Not working 418 81 (19.4) 1 1
Employed 668 143 (21.4) 1.1 (0.8, 1.5) 1.1 (0.9, 1.5)
Tested positive for chlamydia prior to study     
No 965 202 (20.9) 1 1
Yes 114 20 (17.5) 0.8 (0.6, 1.0) 0.8 (0.5, 1.0)
Number of new sexual partners during the studye     
0 - 2 partners 706 173 (24.5) 1 1
> 2 partners 410 66 (16.1) 0.8 (0.6, 1.0) 0.8 (0.5, 1.2)
  1. a 95% confidence interval.
  2. bAdjusted Hazard Ratios = adjusted for type of clinic recruited from, location of recruitment site, age, education level reached, employment status, numbers of new sexual partners at each stage, if tested positive prior to the study.
  3. c General practice clinic.
  4. d Sexual health service/Family Planning clinic.
  5. e Cumulative number of new partners throughout the study.