From: The effect of an internet option and single-sided printing format to increase the response rate to a population-based study: a randomized controlled trial
Logistic Regression, Model term
Crude OR (95% CI)
No intervention
1.00
Web (main effect)
0.95 (0.80, 1.13)
Single-sided (main effect)
1.01 (0.85, 1.20)
Web + Single-sided (interaction term)
1.24 (0.97, 1.59)