Validation of the post sleep questionnaire for assessing subjects with restless legs syndrome: results from two double-blind, multicenter, placebo-controlled clinical trials

Table 4 Convergent validity: PSQ items and MOS Sleep domains at baseline

PSQ item	MOS Sleep Domain Scores
	Daytime somnolence n = 540	Sleep disturbance n = 540	Sleep adequacy n = 540	Sleep quantity n = 539
	Correlation (p-value)	Correlation (p-value)	Correlation (p-value)	Correlation (p-value)
Sleep quality	0.1856 (<0.0001)	0.4878 (<0.0001)	-0.4635 (<0.0001)	-0.3827 (<0.0001)
Daytime functioning	0.4290 (<0.0001)	0.3027 (<0.0001)	-0.4084 (<0.0001)	-0.2287 (<0.0001)
Nights with RLS symptoms	0.0458 (0.2881)	0.1025 (0.0172)	-0.1537 (0.0003)	-0.1207 (0.0050)
RLS-related sleep disturbance	0.1369 (0.0014)	0.3158 (<0.0001)	-0.2188 (<0.0001)	-0.2742 (<0.0001)
RLS-related sleep latency	0.0633 (0.1420)	0.4290 (<0.0001)	-0.2083 (<0.0001)	-0.3798 (<0.0001)

MOS, Medical Outcomes Study; PSQ, Post Sleep Questionnaire; RLS, restless legs syndrome.
Spearman Correlation coefficients.
Higher PSQ scores correspond to worse symptoms.
Higher MOS Daytime Somnolence scores and MOS Sleep Disturbance scores correspond to worse symptoms.
Higher MOS Sleep Adequacy scores and MOS Sleep Quantity scores correspond to better symptoms.

ISSN: 1471-2377