Table 1

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

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


OR = Odds ratio; 95%CI: 95% confidence interval, * = p < .05; ORs are adjusted for all other covariates listed in the table.

aHosmer & Lemeshow test χ2 = 7.79, df = 6, p = .25; Nagelkerke's R2 = 3.5%

bHosmer & Lemeshow test χ2 = 3.52, df = 5, p = .79; Nagelkerke's R2 = 1.9%

cHosmer & Lemshow test χ2 = 6.13, df = 8, p = .63; Nagelkerke's R2 = 4.4%

Sahlqvist et al. BMC Medical Research Methodology 2011 11:62   doi:10.1186/1471-2288-11-62

Open Data