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Percentage of the overall sample completing survey by prompt and data collection point (n=4027).
| Percent complete | Baseline | 3-week | 8-week | 20-week | 32-week |
| Day invitation sent | 56.2 | 30.9 | 31.8 | 24.1 | 22.8 |
| Day after invitation sent | 5.6 | 8.9 | 9.0 | 8.0 | 7.9 |
| Single email remindera | 1.1–2.1 | 3.8–7.9 | 1.4–4.7 | 2.5–5.6 | 2.3–7.0 |
| Single phone reminder | 0.8 | 3.0 | 2.6 | 3.2 | 2.9 |
aFour email reminders were sent for each survey.
