Table 1 

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

Overall^{a} N = 1000 
Prior to reminder^{b} N = 1000 
After reminder^{c} N = 882 

OR 
95% CI 
OR 
95% CI 
OR 
95% CI 



Length 

Long 
1.00 
1.00 
1.00 

Short 
1.48* 
1.062.07 
1.62* 
1.072.45 
1.32 
0.792.18 
Reminder 

Pack 
 
 
 
 
1.00 

Postcard 
 
 
 
 
0.62 
0.371.04 
Approach 

Nonpersonal 
1.00 
1.00 
1.00 

Personal 
1.17 
0.841.64 
1.00 
0.671.50 
1.44* 
1.011.95 
Index of Multiple Deprivation 

Relatively affluent 
1.00 
1.00 
1.00 

Relatively deprived 
0.52* 
0.370.73 
0.65* 
0.430.98 
0.44* 
0.260.75 
City 

Cambridge 
1.00 
1.00 
1.00 

Southampton 
0.90 
0.651.26 
0.96 
0.641.43 
0.78 
0.541.49 


OR = Odds ratio; 95%CI: 95% confidence interval, * = p < .05; ORs are adjusted for all other covariates listed in the table. ^{a}Hosmer & Lemeshow test χ^{2 }= 7.79, df = 6, p = .25; Nagelkerke's R^{2 }= 3.5% ^{b}Hosmer & Lemeshow test χ^{2 }= 3.52, df = 5, p = .79; Nagelkerke's R^{2 }= 1.9% ^{c}Hosmer & Lemshow test χ^{2 }= 6.13, df = 8, p = .63; Nagelkerke's R^{2 }= 4.4% 

Sahlqvist et al. BMC Medical Research Methodology 2011 11:62 doi:10.1186/147122881162 