Table 6

Age-adjusted odds ratio (AOR) of risk of HIV by survey time comparing 2003 and 1995, adjusting for sexual behaviour variables, for rural women aged 15–24

One by one behaviour indicator included

Beh. Indicator

Chi-square change

AOR

95% CI

Ever given birth

0.15

0.28

0.11–0.72

Number of sex partners past 12 months

-1.7

0.31

0.13–0.75

Casual partner past year

-0.62

0.30

0.12–0.72

Condom use at last sexual intercourse

-3.45

0.28

0.09–0.81

Ever used condom**

-4.81

0.32

0.13–0.75

Frequent dry sex

-1.9

0.26

0.11–0.63

Notes: Before adding the behaviour variables the Chi square was 9.53 and AOR 0.27 (0.11–0.68) in 2003 compared to 1995. If the chi square changed > |3.84|, the added variable was a confounding variable. The denominator was the number of sexually active respondents during the year prior to the survey. **The chief confounder in this step.

Sandøy et al. BMC Public Health 2007 7:60   doi:10.1186/1471-2458-7-60