. Author manuscript; available in PMC: 2019 Mar 4.

Published in final edited form as: Exp Brain Res. 2015 Nov 13;234(2):587–595. doi: 10.1007/s00221-015-4490-7

Table 3.

Sleep characteristics

	Young adults (n = 23)	Older adults (n = 15)	p
TST (min)	421.64 ± 62.79	399.45 ± 61.26	.24
Sleep efficiency (%)	94.16 ± 7.02	90.29 ± 7.27	.11
WASO (min)	16.05 ± 22.79	35.97 ± 39.05	.05^*
%N1	9.75 ± 3.54	12.94 ± 4.99	.04^*
%N2	50.58 ± 7.51	56.70 ± 9.03	.03^*
%SWS	20.78 ± 5.03	14.41 ± 6.71	.002^*
%REM	18.90 ± 6.87	15.98 ± 2.84	.07^†
Sleep latency (min)	9.82 ± 12.08	7.73 ± 7.89	.56

TST total sleep time, WASO wake after sleep onset; %N1 = percent of TST in non-REM sleep stage 1; %N2 = percent of TST in non-REM sleep stage 2; SWS = percent of TST in slow wave sleep; %REM = percent of TST in rapid eye movement sleep

p value <.05

^†

p value <.08. Values are mean ± SD