Table 3

Ordered logistic and logistic regression models of sexual behaviour among 15–24-year-old women (n=1336) in KwaZulu-Natal, South Africa (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 disparate1.201.32**1.32*1.48***1.181.28**1.301.43**
(0.92–1.56)(1.03–1.71)(0.99–1.75)(1.12–1.96)(0.92–1.52)(1.00–1.64)(0.95–1.77)(1.04–1.96)
Control variablesNoYesNoYesNoYesNoYes
Partnership Observations13361336133613361336133613361336
  • 95% CI in parentheses.

  • *P<0.1, **p<0.05, ***p<0.01.

  • 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’); self-reported HIV-positive status; 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 S1  for the full models 2, 4, 6 and 8.

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

  • ‡Sex frequency and inconsistent condom use: sex frequency in the previous 12 months categories (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).