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Table 2 Logistic regression analysis of responses (n = 547)

From: Improving response rates using a monetary incentive for patient completion of questionnaires: an observational study

Returned form Coef. (B) P-Value Odds Ratio (95% CI)
Payment 0.79 0.009 2.21 (1.22 to 3.98)
Age 0.05 0.000 1.05 (1.02 to 1.08)
Female 1.09 0.001 2.99 (1.57 to 5.69)
KQoL-26 physical* 0.00 0.704 1.00 (1.00 to 1.01)
KQoL-26 activities* -0.00 0.540 1.00 (0.99 to 1.00)
KQoL-26 emotional* 0.03 0.000 1.03 (1.01 to 1.04)
Constant -1.93 0.002 0.15 (0.04 to 0.49)
  1. Log likelihood = -191.9; Likelihood Ratio χ2 test statistic, 6 df = 52.6 (p < 0.001); Pseudo R2 = 0.12
  2. * KQoL-26 (Knee Quality of Life) is the primary outcome measure