Table 1.
Study characteristics for pilot surveys 1 and 2
| Pilot survey | 1 | 2 |
|---|---|---|
| Year of survey | 2016 | 2017 |
| Region | England (nine regions – former GOR*) | England (nine regions – former GOR*) |
| Number of women sampled | 1000 | 2000 |
| Period of birth | July 2016 | March 2017 |
| Baby age at recruitment | 3 months | 3 months |
| Pre-notification | No | Yes |
| Time of initial mail out | October 2016 | June 2017 |
| Modes of response available | Postal Telephone (interpretation service) Online |
Postal Telephone (interpretation service) Online |
| Quick response (QR) codes | No | Yes |
| Number of reminders | 1 | 2 |
| Timing of reminders | + 4 weeks: reminder questionnaire (week 5) |
+ 4 weeks: reminder questionnaire (week 5) + 10 weeks: reminder questionnaire (week 11) |
| Length of questionnaire | 20 pages | 16 pages |
| Design of questionnaire | Based on previous National Maternity Surveys | More user-friendly language More engaging appearance |
*Government Office Regions