Table 2.

Sleep and activity characteristics of participants

Sleep Characteristic	Control	CKD	HD	Total	P
n	19 (7%)	148 (53%)	114 (41%)	281 (100%)
Rest per day (min)	465 ± 79	457 ± 119	458 ± 151	458 ± 131	1
Sleep onset latency (min/day)	28 ± 27	41 ± 53	78 ± 73	55 ± 64	<0.0001
Snooze time (min/day)	23 ± 23	33 ± 48	38 ± 40	34 ± 44	0.3
Wake but rest per day (min)	0 ± 0	1 ± 5	12 ± 55	5 ± 36	0.03
Active time per day (min)	667 ± 280	836 ± 210	861 ± 195	835 ± 214	<0.01
Sleep per day (min)	366 ± 67	338 ± 96	290 ± 112	320 ± 105	<0.001
Sleep/rest time (%)	78.8 ± 7.9	74.8 ± 12.6	63.3 ± 17.6	70.4 ± 15.8	<0.0001
WASO (min/day)	70 ± 31	74 ± 47	79 ± 67	76 ± 55	0.7
Naps (number/day)	0.2 ± 0.3	0.4 ± 0.6	0.4 ± 0.6	0.4 ± 0.6	0.4
Sleep <5 h/night	2 (11%)	46 (31%)	60 (53%)	108 (38%)	<0.0001
Sleep efficiency (%)	74.1 ± 8.9	67.6 ± 16.8	54.4 ± 21.0	62.7 ± 19.5	<0.0001
Time mobile during sleep/day (min)	57.1 ± 29.8	86.6 ± 57.6	126.4 ± 84.8	100.8 ± 72.1	<0.0001
Fragmentation index	16.8 ± 6.9	24.7 ± 10.7	34.1 ± 16.2	28.0 ± 14.1	<0.0001
Subjective quality of sleep
overall sleep quality	60.6 ± 28.9	59.2 ± 25.3	55.8 ± 24.8	57.9 ± 25.3	0.6
sleep maintenance	65.0 ± 33.1	61.9 ± 28.2	55.8 ± 33.6	59.7 ± 30.8	0.3
sleep sufficiency	52.5 ± 39.2	51.8 ± 30.6	44.7 ± 30.1	49.0 ± 31.1	0.2
daytime somnolence	71.3 ± 37.9	64.7 ± 28.7	73.8 ± 25.7	68.8 ± 28.4	0.05
sleep quality (KDQOL score)	62.3 ± 25.6	59.4 ± 21.2	57.5 ± 19.1	58.8 ± 20.7	0.6

HD, hemodialysis.