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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%