| Telephone | Face-to-face | Face-to-face EWP | |||
---|---|---|---|---|---|---|
 | (n = 2999) | (n = 2893) | (n = 2206) | |||
 | % | (95% CI) | % | (95% CI) | % | (95% CI) |
Father's education | Â | Â | Â | Â | Â | Â |
   Completed primary school | 19.7 | (18.4–21.2) | 22.4 | (21.0–24.0) | 23.7 | (22.0–25.6)** |
   Some high school | 23.2 | (21.8–24.8) | 22.5 | (21.0–24.1) | 22.3 | (20.6–24.1) |
   Completed high school | 9.5 | (8.5–10.6) | 11.8 | (10.7–13.0)* | 11.2 | (9.9–12.6) |
   Trade/Diploma | 17.8 | (16.4–19.2) | 17.2 | (15.9–18.6) | 16.5 | (15.0–18.1) |
   University degree or higher | 9.8 | (8.8–10.9) | 12.2 | (11.0–13.4)* | 11.9 | (10.6–13.3) |
   Other | 0.4 | (0.2–0.7) | 0.2 | (0.1–0.5) | 0.2 | (0.1–0.5) |
   Don't know | 19.6 | (18.2–21.1) | 13.7 | (12.5–15.0)** | 14.1 | (12.7–15.6)** |
Mother's education | Â | Â | Â | Â | Â | Â |
   Completed primary school | 19.8 | (18.5–21.3) | 24.4 | (22.9–26.0)** | 25.8 | (24.1–27.7)** |
   Some high school | 28.9 | (27.3–30.6) | 29.8 | (28.2–31.5) | 29.8 | (27.9–31.7) |
   Completed high school | 14.8 | (13.5–16.1) | 16.1 | (14.8–17.5) | 15.2 | (13.7–16.7) |
   Trade/Diploma | 9.6 | (8.6–10.7) | 8.8 | (7.8–9.9) | 8.0 | (6.9–9.2) |
   University degree or higher | 6.5 | (5.6–7.4) | 8.7 | (7.7–9.8)** | 8.6 | (7.6–9.9)* |
   Other | 0.3 | (0.2–0.6) | 0.1 | (0.0–0.3) | 0.1 | (0.0–0.3) |
   Don't know | 20.1 | (18.7–21.6) | 12.2 | (11.0–13.4)** | 12.5 | (11.2–14.0)** |