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

Table 3 Risk factors associated with HIV acquisition in the Kaiyuan study

Variables	Univariate analysis		Multivariable analysis
Variables	HR (95 % CI)	P	AHR (95 % CI)	P
Year of enrollment
2006–2007	1.00
2008–2009	0.66 (0.27–1.65)	0.37
2010–2011	2.11 (0.71–6.32)	0.18
2012–2013	-
Race
Han	1.00
Minority	1.37 (0.66–2.82)	0.39
Age at enrollment
≤ 25 years	1.00
> 25 years	1.05 (0.52–2.12)	0.88
Marital status^a
Married/cohabiting	1.00
Unmarried/divorced/widowed	0.86 (0.43–1.73)	0.67
Education
≤ 9 years	1.00
≥ 10 years	1.68 (0.73–3.87)	0.22
Census registration
Local	1.00
Other city	0.95 (0.47–1.95)	0.89
Charge^a
Low	1.00		1.00
High	0.21 (0.07–0.59)	0.003	0.30 (0.10–0.86)	0.02
Duration of sex work at enrollment
≤ 3 year	1.00
> 3 years	1.76 (0.85–3.62)	0.12
Number of clients per month^a
≤ 30	1.00
> 30	2.45 (1.06–5.70)	0.04
Condom use^a
Never/Sometimes	1.00		1.00
Always	0.26 (0.12–0.55)	0.0005	0.28 (0.12–0.61)	0.001
Drug use^a
No	1.00		1.00
Yes	3.49 (1.75–6.98)	0.0004	3.06 (1.49–6.30)	0.002
Alcohol use^a
No	1.00
Yes	0.20 (0.20–0.80)	0.01
HSV-2 status^a
Negative	1.00
Positive	3.66 (1.11–12.06)	0.03
Syphilis status^a
Negative	1.00
Positive	3.23 (1.39–7.49)	0.006

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

ISSN: 1471-2334