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Table 3 Four random-intercept logistic regression models relating order of 46 OHIP items as a linear variable or an indicator variable to missing OHIP item responses

From: Is assessment of oral health-related quality of life burdensome? An item nonresponse analysis of the oral health impact profile

   Data collection without supervision Data collection with supervision
General population participants in Sweden Patients and general population participants in Germany, Hungary, Japan, Slovenia, Sweden
  Odds ratio (95% confidence interval)   
Random effects model with item order as linear variable Rank order 1.05 (0.99–1.10) 1.04 (0.97–1.11)
  Intercept 0.01 (0.00–0.00) 0.00 (0.00–0.01)
Random effects model with item order as indicator variable Rank order summary
  Median 0.89 1.61
  IQR* 0.69–1.001 1.15–2.08
  Range 0.37–1.92 0.70–3.06
  Intercept 0.00 (0.00–0.00) 0.00 (0.00–0.00)
  1. *Interquartile range, Summary of 45 estimated ORs of indicator variables (confidence intervals not shown)