Table 4

Ordered logistic and logistic regression models of sexual behaviour among HIV-negative, 15–24-year-old women (n=894) in KwaZulu-Natal (2014–2015)

Model typeSexual frequency†: categories 1–5Sex 10+ times (0/1)Sex frequency and inconsistent condom use‡ (0–5)Sex 10+ times and inconsistent condom use (0/1)
Ordered logitLogitOrdered logitLogit
UnadjustedAdjustedUnadjustedAdjustedUnadjustedAdjustedUnadjustedAdjusted
Model no.12345678
Age disparate1.211.55***1.351.62**1.34*1.54***1.41*1.60**
(0.87–1.69)(1.12–2.14)(0.92–1.98)(1.10–2.40)(0.98–1.82)(1.13–2.09)(0.95–2.08)(1.09–2.36)
Control variablesNoYesNoYesNoYesNoYes
Observations894894894894894894894894
  • 95% CI in parentheses.

  • Control variables included in all analyses: women’s age (15–24 years); education (<secondary, some secondary, secondary completed, some tertiary); household monthly income (≤R500, R501–2500, R2501–6000, >R6000); being away for a period of greater than one consecutive month in the preceding year; HIV knowledge (the sum of the number of sources in the previous 12 months from which participants ‘received HIV information that has been useful to you’); perceived HIV status of sexual partner; partnership duration (<12 months, 1–3 years, more than 3 years); and the nature of each relationship (casual partner, regular partner or spouse). See Supplemental Digital Content, online supplementary table S3 for the full models 2, 4, 6 and 8.

  • *P<0.1, **p<0.05, ***p<0.01.

  • †Sex frequency in previous 12 months categories: once, 2–5, 6–10, 11–20, >20.

  • ‡Sex frequency and inconsistent condom use: sex frequency categories in the previous 12 months (once, 2–5, 6–10, 11–20, >20) multiplied by a binary indicator of inconsistent condom use (0=consistent, 1=inconsistent). Therefore, 0 represents no risk (no unprotected sex) and five represents high-risk (most frequent condomless sex).