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Table 2 Response rates to the NMS (1995–2018)

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

 Year of survey
19952006201020142018
Number of women sampled3570480010,00010,00216,000
Number of undelivered packs/ineligible women (%)N/Aa73 (1.5%)149 (1.5%)216 (2.2%)472 (3.0%)
Number of usable responses24062960533345714509
Response rate (95% CIs)67.4% (65.8, 68.9)62.6% (61.2, 64.0)54.1% (53.1, 55.1)46.7% (45.7, 47.7)29.0% (28.3, 29.8)
Change from previous surveyN/A−4.8%−8.5%−7.4%−17.7%
Annual rate of changeN/A−0.4%−2.1%−1.9%−4.4%
  1. aUndelivered packs were not recorded in 1995