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Table 2 Factors associated with loss to follow-up in the Kaiyuan study

From: Loss to follow-up and HIV incidence in female sex workers in Kaiyuan, Yunnan Province China: a nine year longitudinal study

Variables

Univariate analysis

Multivariable analysis

HR (95 % CI)

P

AHR (95 % CI)

P

Year of enrollment

 2006–2007

1.00

-

1.00

 

 2008–2009

1.12 (0.96–1.29)

0.14

1.19 (1.03–1.39)

0.02

 2010–2011

1.35 (1.06–1.72)

0.02

1.35 (1.04–1.74)

0.02

 2012–2013

1.66 (1.23–2.34)

0.00

2.35 (1.73–3.20)

<0.0001

Race

 Han

1.00

-

  

 Minority

1.06 (0.92–1.22)

0.48

  

Age at enrollment

  ≤ 25 years

1.00

-

1.00

-

  > 25 years

0.65 (0.57–0.74)

<0.0001

0.83 (0.71–0.96)

0.01

Marital statusa

 Married/cohabiting

1.00

-

1.00

-

 Unmarried/divorced/widowed

1.23 (1.08–1.39)

0.001

1.21 (1.06–1.38)

0.007

Education

  ≤ 9 years

1.00

-

  

  ≥ 10 years

0.95 (0.79–1.15)

0.58

  

Census registration

 Local

1.00

-

1.00

-

 Other city

1.52 (1.31–1.75)

<0.0001

1.32 (1.13–1.54)

0.0004

Chargea

 Low

1.00

-

  

 High

1.15 (1.01–1.31)

0.03

  

Duration of sex work at enrollment

  ≤ 3 year

1.00

-

1.00

-

  > 3 years

0.52 (0.45–0.60)

<0.0001

0.67 (0.57–0.79)

<0.0001

Number of clients per montha

  ≤ 30

1.00

-

  

  > 30

0.97 (0.78–1.19)

0.76

  

Condom usea

 Never/Sometimes

1.00

-

1.00

-

 Always

1.56 (1.20–2.03)

0.0009

1.51 (1.15–1.97)

0.003

Drug usea

 No

1.00

-

1.00

-

 Yes

0.51 (0.42–0.61)

<0.0001

0.62 (0.51–0.76)

<0.0001

Alcohol usea

 No

1.00

-

  

 Yes

1.26 (1.10–1.45)

0.001

  

HSV-2 statusa

 Negative

1.00

-

1.00

-

 Positive

0.74 (0.64–0.86)

<0.0001

0.87 (0.75–1.00)

0.05

Syphilis statusa

 Negative

1.00

-

  

 Positive

0.78 (0.60–1.03)

0.08

  
  1. Abbreviations: HSV-2 herpes simplex virus type-2, HR hazard ratio, AHR adjusted hazard ratio
  2. aTime-dependent variables