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Table 1 Adjusted odds ratios and 95% CI for survey response overall, prior to reminder, and after reminder

From: Effect of questionnaire length, personalisation and reminder type on response rate to a complex postal survey: randomised controlled trial

  Overalla
N = 1000
Prior to reminderb
N = 1000
After reminderc
N = 882
  OR 95% CI OR 95% CI OR 95% CI
Length       
   Long 1.00   1.00   1.00  
   Short 1.48* 1.06-2.07 1.62* 1.07-2.45 1.32 0.79-2.18
Reminder       
   Pack - - - - 1.00  
   Postcard - - - - 0.62 0.37-1.04
Approach       
   Non-personal 1.00   1.00   1.00  
   Personal 1.17 0.84-1.64 1.00 0.67-1.50 1.44* 1.01-1.95
Index of Multiple Deprivation
   Relatively affluent 1.00   1.00   1.00  
   Relatively deprived 0.52* 0.37-0.73 0.65* 0.43-0.98 0.44* 0.26-0.75
City       
   Cambridge 1.00   1.00   1.00  
   Southampton 0.90 0.65-1.26 0.96 0.64-1.43 0.78 0.54-1.49
  1. OR = Odds ratio; 95%CI: 95% confidence interval, * = p < .05; ORs are adjusted for all other covariates listed in the table.
  2. aHosmer & Lemeshow test χ2 = 7.79, df = 6, p = .25; Nagelkerke's R2 = 3.5%
  3. bHosmer & Lemeshow test χ2 = 3.52, df = 5, p = .79; Nagelkerke's R2 = 1.9%
  4. cHosmer & Lemshow test χ2 = 6.13, df = 8, p = .63; Nagelkerke's R2 = 4.4%