The simplified Chinese version of the Nonrestorative Sleep Scale in Chinese young adults and measurement invariance across language and age

Table 5 Correlations between Chinese NRSS scores and global scores of other subjective scales (n = 232)

Subscales of NRSS	PSQI	PHQ-4
Refreshment from sleep	−0.60^**	−0.34^**
Physical/Medical symptoms of NRS	−0.40^**	−0.42^**
Daytime function	−0.44^**	−0.42^**
Affective symptoms	−0.42^**	−0.40^**
Global score	−0.61^**	−0.53^**

NRSS: Nonrestorative Sleep Scale; PSQI: Pittsburgh Sleep Quality Index; PHQ-4: Patient Health Questionnaire-4; NRS: nonrestorative sleep
^**: P < 0.01

ISSN: 2050-7283