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.