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. Author manuscript; available in PMC: 2022 Nov 1.
Published in final edited form as: Neurobiol Learn Mem. 2021 Aug 25;185:107508. doi: 10.1016/j.nlm.2021.107508

Table 2.

Group means and standard deviations of sleep statistics.

Young adults Older adults Age differences
M (SD) M (SD) (p-value)
TST (min) 112.5 (12.2) 105.5 (21.7) 0.25
NREM1 (min) 16.4 (13.5) 11.8 (8.0) 0.23
NREM2 (min) 53.8 (16.9) 58.2 (17.1) 0.45
NREM3 (min) 17.1 (14.8) 15.1 (16.5) 0.71
REM (min) 10.9 (8.0) 7.7 (11.4) 0.34
NREM1 (% TST) 15.1 (12.4) 12.0 (8.8) 0.40
NREM2 (% TST) 47.4 (12.9) 55.3 (11.9) 0.07
NREM3 (% TST) 14.9 (12.7) 13.2 (14.0) 0.70
REM (% TST) 9.6 (6.8) 6.9 (10.0) 0.34

TST – Total sleep time; M – mean; SD – standard deviation.