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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