OR for cumulative response of questionnaires in 12 weeks
| Unadjusted | Age-adjusted | |||
|---|---|---|---|---|
| OR | 95% CI | OR | 95% CI | |
| Interventions | ||||
| Type of return envelope | ||||
| Business-reply return envelope | Referent | Referent | ||
| Stamped return envelope | 1.10 | (1.00 to 1.21) | 1.09 | (0.995 to 1.20) |
| Timing of newsletter delivery | ||||
| With reminder mailing | Referent | Referent | ||
| With initial mailing | 1.18 | (1.07 to 1.29) | 1.18 | (1.07 to 1.30) |
| Demographic and lifestyle factors | ||||
| Age at survey (for 1 year increase) | 1.02 | (1.01 to 1.03) | ||
| Nursing licence | ||||
| Registered nurse | Referent | Referent | ||
| Licenced nurse | 0.879 | (0.728 to 1.06) | 0.780 | (0.643 to 0.946) |
| Midwives | 0.932 | (0.786 to 1.10) | 0.934 | (0.788 to 1.11) |
| Public health nurse | 1.65 | (1.06 to 2.59) | 1.67 | (1.06 to 2.62) |
| Work | ||||
| Not working | Referent | Referent | ||
| Working | 0.802 | (0.658 to 0.976) | 0.886 | (0.725 to 1.08) |
| Region of residence | ||||
| Hokkaido | 1.66 | (1.08 to 2.54) | 1.64 | (1.07 to 2.52) |
| Tohoku | 1.02 | (0.848 to 1.23) | 0.986 | (0.817 to 1.19) |
| Kanto | Referent | Referent | ||
| Hokuriku_Koshin | 0.976 | (0.821 to 1.16) | 0.937 | (0.787 to 1.12) |
| Tokai | 1.03 | (0.842 to 1.26) | 0.988 | (0.807 to 1.21) |
| Kinki | 0.968 | (0.814 to 1.15) | 0.959 | (0.806 to 1.14) |
| Cyugoku | 0.967 | (0.790 to 1.18) | 0.925 | (0.755 to 1.13) |
| Shikoku | 0.977 | (0.794 to 1.20) | 0.956 | (0.775 to 1.18) |
| Kyusyu | 0.856 | (0.721 to 1.02) | 0.828 | (0.697 to 0.983) |
| Okinawa | 0.620 | (0.417 to 0.923) | 0.593 | (0.398 to 0.883) |
| Type of residence area* | ||||
| Not urban | Referent | Referent | ||
| Urban | 1.14 | (1.01 to 1.29) | 1.17 | (1.03 to 1.32) |
| Smoking | ||||
| Non-smoker | Referent | Referent | ||
| Smoker | 0.624 | (0.536 to 0.726) | 0.634 | (0.545 to 0.738) |
| Drinking | ||||
| <3 days a week | Referent | Referent | ||
| ≥3 days a week | 0.907 | (0.810 to 1.02) | 0.896 | (0.800 to 1.00) |
| Pregnancy† | ||||
| Not pregnant | Referent | Referent | ||
| Pregnant | 1.05 | (0.651 to 1.69) | 1.26 | (0.776 to 2.03) |
| Menopause† | ||||
| Not postmenopausal | Referent | Referent | ||
| Postmenopausal | 1.52 | (1.37 to 1.68) | 1.52 | (1.30 to 1.78) |
| Participation in previous survey | ||||
| Wave II not participated | Referent | Referent | ||
| Participated | 2.08 | (1.79 to 2.40) | 2.01 | (1.74 to 2.33) |
| Wave III not participated | Referent | Referent | ||
| Participated | 7.08 | (6.11 to 8.22) | 7.0 | (6.03 to 8.12) |
| Wave IV not participated | Referent | Referent | ||
| Participated | 17.7 | (14.9 to 21.1) | 17.5 | (14.7 to 20.9) |
*Urban areas are Tokyo metropolitan area and other 19 large cities designated by government ordinance.
†Data in latest available survey.