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Table 4 Results of logistic regression

From: Response rate of patient reported outcomes: the delivery method matters

  Stringent Intention to treat As treated
OR 95%CI OR 95% CI   OR 95% CI
Delivery method
 Email N = 202 0.24 (0.14–0.41) 0.32 (0.21–0.60) N = 201 0.27 (0.16–0.45)
 Hybrid N = 204 0.34 (0.22–0.54) 0.77 (0.49–1.21) N = 151 0.45 (0.28–0.71)
 Mail (reference) N = 196    N = 250  
Sex (female reference)   1.16 (0.82–1.64) 1.08 (0.77–1.52)   1.11 (0.79–1.56)
Age
  < 50 yrs.   1.20 (0.47–3.08) 0.79 (0.32–1.96)   0.81 (0.32–2.03)
 50–59 yrs.   1.54 (0.77–3.07) 1.16 (0.60–2.23)   1.13 (0.58–2.18)
 60–69 yrs.   2.16 (1.13–4.01) 1.49 (0.81–2.72)   1.48 (0.80–2.74)
 70–79 yrs.   1.43 (0.76–2.69) 1.69 (0.94–3.06)   1.49 (0.81–2.71)
  > 79 yrs. (reference)      
Education level
 Low   0.45 (0.29–0.69) 0.47 (0.31–0.72)   0.48 (0.31–0.73)
 Middle   0.87 (0.57–1.33) 0.75 (0.48–1.14)   0.76 (0.50–1.17)
 High (reference)      
Time since the last visit
  < 5 yrs.   0.45 (0.18–1.12) 0.68 (0.28–1.72)   0.77 (0.31–1.87)
  ≥ 5 yrs. (reference)      
Interaction term
 time last visit x delivery method   0.55 (0.36–0.84) 0.67 (0.43–1.03)   0.72 (0.48–1.08)
Model χ2   < 0.001   < 0.001    < 0.001  
Hosmer and Lemeshow 0.43   0.51    0.18  
  1. In all regression models, response rate was the dependent variable. The independent variables were delivery method, age, sex, education level, and time since the last visit. Also, the interaction term time since the last visit x delivery method was included; other interaction terms were not significant and therefore not included in the regression models. The χ2 and the Hosmer and Lemeshow show the p-values of the goodness of fit tests. The time since the last visit is the years since the last consultation in the hospital. Statistically significant effects are shown in italics
  2. OR Odds ratio, CI confidence interval, yrs years