Assessment of Perioperative Sleep Characteristics Using Subjective and Objective Methods: A Secondary Analysis of Prospective Cohort Study

Table 2

Correlations of sleep fragmentation, sleep latency, and sleep time between WatchPAT and SMHSQ.

	Variable	WatchPAT	SMHSQ				Partial
Preoperative	Sleep fragmentation (times/night)	(2-7)	(0-7)	<0.001	0.31 [0.10, 0.49]	0.004	0.34 [0.12, 0.53]	0.003
	Sleep latency (min)	(5-63)	(1-150)	0.014	0.34 [0.14, 0.52]	0.001	0.33 [0.11, 0.52]	0.004
	Night sleep time (hours)	(1.3-8.0)	(4.0-11.7)	<0.001	0.35 [0.15, 0.52]	<0.001	0.33 [0.11, 0.52]	0.005
Postoperative	Sleep fragmentation (times/night)	(1-7)	(0-7)	<0.001	0.00 [-0.23, 0.23)	0.969	-0.10 [-0.34, 0.16]	0.464
	Sleep latency (min)	(5-73)	(0-300)	0.519	-0.16 [-0.38, 0.09]	0.213	-0.03 [-0.30, 0.24]	0.805
	Night sleep time (hours)	(1.9-9.3)	(0-11)	0.059	0.09 [-0.14, 0.32]	0.431	-0.01 [-0.27, 0.25]	0.925

Data are presented as (range) as well as correlation and 95% confidence interval. . SMHSQ: St. Mary’s Hospital Sleep Questionnaire; WatchPAT (Itamar Medical, Caesarea, Israel): portable sleep monitoring device; : Pearson’s correlation; Partial : partial correlation. Partial correlation was computed and adjusted for admission type, anesthesia type, depression, obesity, and pAHI. value was obtained from paired test to compare the mean values between WatchPAT and SMHSQ.