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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.