Table 5.

Sleep Architecture Variables for Children With Down Syndrome for Those With and Without a Diagnosis of OSA.^a

Variable	OSA (n = 315)	No OSA (n = 82)	P value
Sleep
Efficiency, %	82.3 (11)	80.6 (12)	.21
Latency, min	29.5 (36)	31 (34.4)	.60b
Median [IQR]	17.5 [0–202]	20.6 [0–150.8]
Total time, min
Sleep	430.4 (71.3)	409.1 (84.7)	.03
In bed	524.6 (54.3)	510.8 (77.5)	.13
REM latency, min	124.1 (64.9)	137.2 (71.1)	.12
NREM stage, %
1	3 (1)	3 (2)	.90
2	47 (7)	47 (7)	.59
3	28 (7)	29 (8)	.30
REM
Sleep, %	22.8 (6)	21 (7)	.03
Cycles	5.1 (1.8)	4.6 (1.4)	.01
Arousal index per hour	13.9 (5)	11.2 (4.1)	<.0001

Abbreviations: IQR, interquartile range; NREM, non–rapid eye movement; OSA, obstructive sleep apnea; REM, rapid eye movement.

^aValues are presented as mean (SD).

^bWilcoxon rank sum test.