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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: J Am Geriatr Soc. 2011 Feb;59(2):224–232. doi: 10.1111/j.1532-5415.2010.03264.x

Table 1.

Baseline Variables × Condition.

BASELINE
Short Long
AGE 72.3 ± 9.3 67.55 ± 10.3
GENDER 6M, 5F 5M, 6F
BT (hh:mm) 23:23 ± :56 24:02 ± 1:15
WT (hh:mm) 07:06 ± :48 07:45 ± 1:15
Polysomnographic Sleep
Sleep Efficiency (%) (TST/SPT) 83.0 ± 9.9 82.0 ± 8.4
SOL (min) 16 ± 13 19 ± 12
SPT (min) 451 ± 68 445 ± 38
TST (min) 370 ± 49 364 ± 47
WASO (min / %) 80 ± 51 / 17.0 ± 9.9 81 ± 39 / 18.0 ± 8.4
Stage 1 (min / %) 24 ± 25 / 5.4 ± 4.7 25 ± 14 / 5.5 ± 3.0
Stage 2 (min / %) 181 ± 57 / 40.0 ± 11.8 172 ± 32 / 38.3 ± 5.0
SWS (min / %) 84 ± 35 / 19.4 ± 8.9 85 ± 23 / 19.3 ± 5.9
REM (min / %) 80 ± 43 / 18.3 ± 10.2 83 ± 23 / 18.8 ± 4.6

Abbreviations: BT - bedtime; WT - wakeup time; TST - total sleep time; SPT - sleep period time (from sleep onset to wakeup time); WASO - wakefulness after sleep onset; SWS - slow wave sleep; REM - rapid eye movement; SOL - sleep onset latency (to first epoch of Stage 2, SWS, or REM).