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Table 1 The effect of the strategies on response rates

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)