Table 2.

Sleep characteristics

	Able-Bodied	SCI
W, h	0.9 ± 0.51	1.02 ± 1.04
N1, h	0.9 ± 0.56	0.62 ± 0.52
N2, h	1.78 ± 1.09	1.35 ± 0.66
N3, h	0.62 ± 0.81	0.55 ± 0.68
R, h	0.21 ± 0.23	0.17 ± 0.40
TST, h	3.2 ± 2.1	2.7 ± 1.3
SI, swallows/h	3.3 ± 4.5	5.1 ± 5.0
Total AI, arousals/h	34.6 ± 18.5	38.1 ± 25.3
SAI, arousals with swallow/h	2.3 ± 2.5	4.6 ± 5.1
AHI, events/h	15.5 ± 13.2	27.7 ± 25.9
ODI, desaturation/h	1.93 ± 3.1	12.4 ± 17.1*
OAI, events/h	5.0 ± 6.5	9.2 ± 20.9

All values mean ± SD; n = 13 able-bodied, 16 SCI. AHI, apnea-hypopnea index; N1, non-REM stage 1; N2, non-REM stage 2; N3, non-REM stage 3; OAI, obstructive apnea index; ODI, oxygen desaturation index; R, REM; REM, rapid eye movement; SAI, swallow arousal index; SCI, spinal cord injury; SI, swallow index; Total AI, total arousal index; TST, total sleep time; W, wake.

^*P < 0.05 for SCI vs. AB.