Table 2.
Descriptive statistics of the sample of women of childbearing age between 15 and 49 years by time period, South Africa
| Variables | Survey year % 95% CI |
||||||
|---|---|---|---|---|---|---|---|
| 1998 | 2008 | 2010/2011 | 2012 | 2014/2015 | 2016 | 2017 | |
| Sample | 5403 | 7298 | 7713 | 8683 | 9703 | 8210 | 10,267 |
| Age, mean (SD) | 29.8 (9.71) | 29.7 (9.87) | 29.6 (9.88) | 29.8 (9.75) | 30.0 (9.79) | 30.4 (9.80) | 30.3 (9.48) |
| Population group | |||||||
| Black African | 78.4 | 79.5 | 80.1 | 80.9 | 81.7 | 86.7 | 82.1 |
| 75.9–80.7 | 74.3–83.8 | 74.8–84.6 | 75.5–85.4 | 76.9–85.6 | 84.4–88.7 | 77.8–85.7 | |
| non-Black African | 21.6 | 20.5 | 19.9 | 19.1 | 18.3 | 13.3 | 17.9 |
| 19.3–24.1 | 16.2–25.7 | 15.4–25.2 | 14.6–24.5 | 14.4–23.1 | 11.3–15.4 | 14.3–22.2 | |
| Education | |||||||
| No school/primary | 41.9 | 18.7 | 15.6 | 13.6 | 10.7 | 11.0 | 7.8 |
| 39.9–43.9 | 16.9–20.7 | 14.0–17.4 | 12.0–15.3 | 9.6–12.0 | 9.9–12.2 | 6.9–8.8 | |
| Secondary | 51.1 | 67.9 | 69.9 | 69.9 | 71.6 | 77.2 | 71.4 |
| 49.2–53.0 | 65.9–69.8 | 67.9–71.8 | 67.9–71.9 | 7.0–73.4 | 7.6–7.9 | 6.9–73.3 | |
| Tertiary | 7.0 | 13.4 | 14.5 | 16.5 | 17.6 | 11.8 | 20.8 |
| 6.1–8.1 | 11.4–15.7 | 12.7–16.5 | 14.5–18.6 | 15.9–19.6 | 10.4–13.4 | 18.8–22.9 | |
| Area of residence | |||||||
| Rural | 36.4 | 37.2 | 39.8 | 39.9 | 39.0 | 32.8 | 34.8 |
| 34.9–38.1 | 32.4–42.3 | 34.3–45.6 | 34.6–45.4 | 34.1–44.1 | 30.6–35.2 | 30.4–39.5 | |
| Urban | 63.6 | 62.8 | 60.2 | 60.1 | 61.0 | 67.2 | 65.2 |
| 61.9–65.1 | 57.7–67.6 | 54.4–65.7 | 54.6–65.4 | 55.9–65.9 | 64.8–69.4 | 60.5–69.6 | |
| Current smoking status | 11.5 | 8.9 | 7.8 | 6.5 | 7.7 | 6.9 | 6.7 |
| Yes | 10.3–12.9 | 7.2–10.9 | 5.9–10.3 | 4.9–8.6 | 5.8–10.0 | 5.8–8.2 | 5.4–8.1 |
| 88.5 | 91.1 | 92.2 | 93.5 | 92.3 | 93.1 | 93.3 | |
| No | 87.1–89.7 | 89.1–92,8 | 89.7–94.1 | 91.4–95.1 | 90.0–94.2 | 91.8–94.2 | 91.9–94.6 |
| Socioeconomic status quintile | |||||||
| 1 (poorest) | 14.9 | 20.1 | 20.0 | 19.9 | 20.0 | 19.3 | 20.1 |
| 13.1–16.8 | 17.7–22.7 | 17.6–22.7 | 17.4–22.8 | 17.6–22.7 | 16.7–22.2 | 17.7–22.8 | |
| 2 (poor) | 18.4 | 19.9 | 20.0 | 20.0 | 19.9 | 19.9 | 20.0 |
| 16.6–20.5 | 17.9–22.1 | 17.9–22.2 | 18.0–22.1 | 18.0–22.0` | 18.0–21.9 | 18.1–22.0 | |
| 3 (middle) | 20.5 | 20.0 | 20.1 | 20.0 | 20.1 | 21.1 | 20.0 |
| 18.6–22.6 | 17.8–22.4 | 18,2–22.1 | 17.9–22.3 | 18,3–22.0 | 19.2–23.2 | 18.3–21.9 | |
| 4 (rich) | 23.7 | 20.0 | 20.0 | 20.0 | 19.9 | 20.8 | 20.2 |
| 21.4–26.1 | 17.8–22.4 | 17.7–22.4 | 18.0–22.2 | 18.0–22.0 | 18.7–23.2 | 18.4–22.1 | |
| 5 (richest) | 22.5 | 20.0 | 20.0 | 20.0 | 20.0 | 18.8 | 19.7 |
| 20.3–24.9 | 16.3–24.2 | 16.4–24.2 | 16.5–24.1 | 17.3–23.1 | 16.2–21.8 | 16.9–22.7 | |
SD standard deviation, % percent, 95% CI 95% confidence interval