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. Author manuscript; available in PMC: 2005 Sep 13.
Published in final edited form as: J Dev Behav Pediatr. 2001 Aug;22(4):226–233. doi: 10.1097/00004703-200108000-00003

Table 2.

Means and Standard Deviations Of Sleep-Wake Variables by Age Group

QS%
AS%
AW%
OOC%
LSP(min)
No. Wakings
Age (mo) Mean SD Mean SD Mean SD Mean SD Mean SD Mean SD
3 38.4 5.6 57.4 5.5 4.6 1.6 5.5 6.0 307.8 70 2.9 1.3
6 43.6 5.6 52.1 6.3 6.3 2.5 2.6 2.3 351.5 112 3.5 1.7
9 47.0 8.3 47.7 8.5 6.8 2.8 3.3 4.0 294.8 89 4.7 3.0
12 49.6 4.3 45.2 5.0 6.9 4.7 2.1 3.6 356.0 88 2.6 1.6

QS% = percentage of quiet sleep; AS% = percentage of active sleep; AW% = percentage of time awake; OOC% = percentage of time out of crib; LSP = longest sleep period in minutes; No. wakings, number of middle of the night wakings.