Table 2.
Means, standard deviations, and t-tests of difference in bedtimes, TST, and sleepiness from pre-treatment to post-treatment among Sleep Improvement Groups.a
| Sleep Improvement Groups | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||
| BT Imprv N=22 |
No BT Imprv N=20 |
t | TST Imprv N=24 |
No TST Imprv N=18 |
t | Sleepiness Imprv N=13 |
No Sleepiness Imprv N=23 |
t | |
| BT Diff (hours) | −.96 (.71) | .56 (.48) | 8.05** | −.79 (.86) | .50 (.58) | 5.50** | −.49 (1.10) | −.07 (.98) | −1.19 |
| TST Diff (hours) | −1.62 (1.64) | .35 (.68) | 4.98** | −1.61 (1.53) | .55 (.46) | 5.77** | −.68 (1.28) | −.64 (1.82) | −.07 |
| Sleepiness Diff (score) | −.63 (2.91) | 1.12 (7.23) | .97 | 1.10 (6.64) | 1.07 (2.60) | −1.19 | −3.43 (1.99) | 2.17 (5.51) | −3.64** |
Note. Data are expressed as the mean (and standard deviation) or as t-values. Imprv=Improvement; Diff=Difference; t=t-values from independent samples t-tests; BT Diff=bedtime difference from pre-treatment to post-treatment; TST Diff=total sleep time difference from pre-treatment to post-treatment; Sleepiness Diff =sleepiness difference from pre-treatment to post-treatment.
a
This table does not reflect the full sample because 7 participants dropped out during treatment. 4 participants were missing sleepiness data. Values displayed are means (and standard deviations).
*
p <.05;
**
p <.001.