Table 2.

Polysomnography-measured sleep variables in CKD and ESKD

Variable	CKD, n=88	ESKD, n=92	P Value
Apnea hypopnea index, events/h	8.9 [3.4; 27.0]	14.6 [5.5; 29.5]	0.15
Total sleep, h	6.1 (1.7)	5.2 (2.0)	0.001
Sleep efficiency, %	74.4 (15.0)	69.1 (16.0)	0.03
Nocturnal hypoxemia, %	0.5 [0.0; 5.3]	1.9 [0.1; 9.5]	0.01
Periodic leg movement index, events/h	34.5 [15.9; 55.8]	39.9 [12.1; 87.2]	0.64
Mean oxygen saturation, %	95.0 (1.9)	93.5 (2.5)	<0.001
Oxygen desaturation index, events/h	4.2 [0.8; 13.7]	7.6 [1.9; 16.0]	0.05

Table shows mean (SD), median [quartile 1; quartile 3], or frequency (%). P values were on the basis of a two-sample t test or Wilcoxon rank-sum test for continuous variables, and chi-squared or Fisher exact test for categorical variables.