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

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

Domain name	Average (range 1–7)	Standard deviation	Lowest score (1–1.5)	Highest score (6.5–7)	Cronbach’s α	ICC^a	SEM^a
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

ICC = intraclass correlation efficient, SEM = standard error of measurement
a. n = 105
b. These domains are formative, and Cronbach’s α is only relevant when a domain is one-dimensional (36)

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