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Table 1 Study characteristics for the NMS (1995–2018)

From: Trends in response rates and respondent characteristics in five National Maternity Surveys in England during 1995–2018

Year of survey19952006201020142018
Sample sourceONS birth registrationsONS birth registrationsONS birth registrationsONS birth registrationsONS birth registrations
Number of women sampled3570480010,00010,00216,000
RegionEngland and WalesEnglandEnglandEnglandEngland
Period of birthJune–July 1995March 2006October–November 2009January 2014October 2018
Baby age at recruitment4 months3 months3 months3 months6 months
Time of initial mail outNovemberJuneJanuaryAprilApril
Modes of response availablePostalPostal
Telephone (interpretation service)
Postal
Telephone (interpretation service)
Online
Postal
Telephone (interpretation service)
Online
Postal
Telephone (interpretation service)
Online
IncentiveNoneNoneNoneNonePrize draw for £500 gift voucher
Number or reminders02332a
Timing of reminders (from initial mail-out)N/A+  2 weeks: reminder letter
+  4 weeks: reminder questionnaire
+  2 weeks: reminder letter
+  4 weeks: reminder questionnaire
+  8 weeks: reminder letter
+  2 weeks: reminder letter
+  4 weeks: reminder questionnaire
+  8 weeks: reminder letter
+  3 weeks: reminder questionnaire
+  7 weeks: reminder questionnaire
Length of questionnaire44 pages28 pages28 pages28 pages16 pages
  1. a The number of reminders in the 2018 NMS was reduced at the request of the Research Ethics Committee