The age-sex bands, sample size, and response rates of the study population
| Band | Age | Sample size1-150 | Response rate (%) | χ2 (p value) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Practice 1 | Practice 2 | Practice 3 | Total | ||||||
| Women | |||||||||
| F1 | 16–44 | 716 | 78.9 | 73.1 | 65.0 | 72.31-151 | 14.43 (p<0.001) | ||
| F2 | 45–64 | 737 | 88.0 | 85.6 | 84.1 | 85.9 | |||
| F3 | 65–74 | 740 | 90.3 | 79.3 | 84.6 | 84.71-151 | 11.43 (p<0.01) | ||
| F4 | 75+ | 718 | 82.6 | 74.5 | 74.2 | 77.0 | |||
| Total women | 2911 | 85.0 | 78.1 | 77.1 | 80.0 | ||||
| Men | |||||||||
| M1 | 16–44 | 687 | 67.7 | 61.1 | 54.4 | 61.11-151 | 9.51 (p<0.01) | ||
| M2 | 45–64 | 714 | 84.4 | 79.6 | 77.1 | 80.4 | |||
| M3 | 65–74 | 730 | 86.1 | 82.6 | 84.4 | 84.4 | |||
| M4 | 75+ | 710 | 82.1 | 78.8 | 81.9 | 80.8 | |||
| Total men | 2841 | 80.2 | 75.7 | 74.8 | 76.9 | ||||
| Overall total | 5752 | 82.6 | 76.9 | 76.0 | 78.5 | ||||
↵1-150 Subjects registered at a different address on the electoral register from that to which the questionnaire was mailed were assumed not to have received the questionnaire, and removed from the denominator.
↵1-151 Significant difference between practices in response rate (questionnaires returned blank are included as responders for this test).