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. Author manuscript; available in PMC: 2014 May 14.
Published in final edited form as: J Am Geriatr Soc. 2008 Aug 5;56(9):1681–1686. doi: 10.1111/j.1532-5415.2008.01822.x

Table 2.

Means and Standard Deviations for the Time of Day of Nap Groups for Objective and Subjective Sleep

Actigraphy sleep and nap variables
SOL (mins) WASO (mins) SE (%) TST (mins)
Nap Group M SD M SD M SD M SD
Daytime-only 26.50* 13.01 72.82┼ 24.65 76.80§ 6.41 382 43.04
Day/evening 20.00* 12.28 51.43┼ 21.99 81.95§ 5.80 393 58.71
Sleep Diary sleep and nap variables
SOL (mins) WASO (mins) SE (%) TST (mins)
Nap Group M SD M SD M SD M SD
Daytime-only 25.61 16.74 25.19 23.50 86.05 6.65 430 46.89
Day/evening 23.92 19.73 28.72 26.28 84.97 9.43 408 69.02

Note: SOL (sleep onset latency) refers to the number of minutes spent awake from bedtime to the onset of sleep; WASO (wake after sleep onset) refers to the total number of minutes spent awake during the night excluding SOL; SE (sleep efficiency) is a ratio of the time spent sleeping to the time spent in bed; TST (total sleep time) refers to the time spent asleep during the night excluding SOL and WASO.

*

Group means were significantly different, p<.05.

┼

Group means were significantly different, p<.001.

§

Group means were significantly different, p<.01.