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. 2012 Sep 4;2(5):e001181. doi: 10.1136/bmjopen-2012-001181

Table 2.

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.