Table 1

Sociodemographic characteristics of a cohort of 3889 young women between the ages of 11 and 20 years in rural Agincourt, South Africa, by participation in the HPTN 068 trial

Total (n=3889)Trial participant* (n=1720)Non-participant (n=2169)P value
n%n%n%
Age in 2011<0.0001
 11–121884.8261.51627.5
 13–14127032.763737.063329.2
 15–16159140.979346.179836.8
 17–1866717.223913.942819.7
 19–201734.5251.51486.8
SES 0.003
 At or above median17785085352.792547.8
 Below median17785076647.3101252.3
 Missing333101232
Household size 0.5
 Mean8.48.48.5
 SD4.24.04.4
 Missing461432
Gender of household head 0.3
 Female159041.769140.889942.4
 Male222458.3100459.2122057.6
 Missing752550
Household head educational attainment 0.02
 <Grade 12306286.3139887.8166485.1
 Grade 12 or higher48613.719412.229214.9
 Missing341128213
Country of origin 0.2
 South Africa231559.6104660.9126958.6
 Mozambique157040.467339.289741.4
 Missing413
Childbearing before 2011<0.0001
 Yes2747.1673.92079.5
 No361593.0165396.1196290.5
Intervention arm
 Control82050.4
 Intervention80649.6
2011 school enrolment<0.0001
 Yes350895.7163799.2187192.9
 No1584.3140.91447.2
 Missing22369154
2015 school enrolment<0.0001
 Yes246574.2123419123168.5
 No85625.82908156631.5
 Missing568196372
  • *Due to restrictions in the cohort construction to maintain comparable groups with respect to age and education status in 2009, not all of the 2533 HPTN 068 participants are represented.

  • †P values for categorical variables are from Χ2 tests and for continuous variables from t-tests.

  • ‡Measured in 2009.

  • HPTN, HIV Prevention Trial Network; SES, socioeconomic status.