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Table 3 PRAQ outcome domains: scores and reliability parameters (n = 180)

From: Instrument completion and validation of the patient-reported apnea questionnaire (PRAQ)

Domain name Average (range 1–7) Standard deviation Lowest score (1–1.5) Highest score (6.5–7) Cronbach’s α ICCa SEMa
Sleepiness 3.13 1.57 20% 2.2% 0.88 0.81 0.69
Energy&daily activities 4.52 1.59 4.4% 7.8% 0.95 0.86 0.60
Emotions 2.89 1.28 13.3% 0.0% 0.92 0.85 0.50
Symptoms at night 3.48 1.27 3.9% 1.1% - b 0.88 0.44
Social Interactions 3.11 1.42 13.9% 0.6% - b 0.86 0.53
  1. ICC = intraclass correlation efficient, SEM = standard error of measurement
  2. a. n = 105
  3. b. These domains are formative, and Cronbach’s α is only relevant when a domain is one-dimensional (36)