Table 2 Response rates to the NMS (1995–2018)
Year of survey | |||||
|---|---|---|---|---|---|
1995 | 2006 | 2010 | 2014 | 2018 | |
Number of women sampled | 3570 | 4800 | 10,000 | 10,002 | 16,000 |
Number of undelivered packs/ineligible women (%) | N/Aa | 73 (1.5%) | 149 (1.5%) | 216 (2.2%) | 472 (3.0%) |
Number of usable responses | 2406 | 2960 | 5333 | 4571 | 4509 |
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 survey | N/A | −4.8% | −8.5% | −7.4% | −17.7% |
Annual rate of change | N/A | −0.4% | −2.1% | −1.9% | −4.4% |