Table 4.
Sleep Diary Outcomes - Last Observation Carried Forward Analyses
| Measures | Baseline | Post-Treatment | 3-mo Follow-up | Within Groups |
Between Groups |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Baseline to Posta |
Post to Follow-upa |
Base to Follow- upa |
Group × Timeb. c | |||||||||
| M | (SD) | M | (SD) | M | (SD) | Δ (Hedges gav) | Δ (Hedges gav) | Δ (Hedges gav) | F | p | η2p | |
| Sleep Onset Latency (mins.) | 4.96 | .01 | .08 | |||||||||
| BBTi | 51.32 | (37.31) | 27.37 | (25.05) | 29.37 | (24.77) | −23.95 (.75)*** | 2.00 (.08) | −21.95 (.69)*** | |||
| SMC | 41.9 | (41.79) | 34.79 | (32.29) | 37.15 | (56.06) | −7.11 (.19) | 2.36 (.05) | −4.75 (.10) | |||
| Wake After Sleep Onset (mins.) | 8.19 | .00 | 0.12 | |||||||||
| BBTi | 66.95 | (37.24) | 40.84 | 31.87 | 41.64 | (31.08) | −26.11 (.75)*** | 0.80 (.03) | −25.31 (.74)*** | |||
| SMC | 51.66 | (25.02) | 46.01 | 33.6 | 52.15 | (34.18) | −5.65 (.19) | 6.14 (.18)* | 0.49 (.02) | |||
| Total Sleep Time (mins.) | 2.79 | .08 | 0.05 | |||||||||
| BBTi | 349.17 | (68.13) | 355.15 | 68.46 | 371.94 | (71.46) | 5.98 (.09) | 16.79 (.24)* | 22.77 (.33) | |||
| SMC | 373.09 | (91.38) | 390.43 | 77.04 | 377.29 | (85.33) | 17.34 (.21) | −13.14 (.16) | 4.20 (.05) | |||
| Sleep Efficiency (%) | 10.14 | .00 | 0.15 | |||||||||
| BBTi | 69.56 | (12.19) | 80.47 | 12.12 | 80.64 | (12.31) | 10.91 (.90)*** | 0.17 (.01) | 11.08 (.90)*** | |||
| SMC | 75.47 | (12.86) | 78.74 | 12.2 | 77.6 | (14.02) | 3.27 (.26) | −1.14 (.09) | 2.13 (.16) | |||
| Sleep Quality Rating | 6.68 | .00 | 0.1 | |||||||||
| BBTi | 2.69 | (0.55) | 3.07 | 0.63 | 3.11 | (0.59) | 0.38 (.64)*** | 0.04 (.07) | 0.42 (.74)*** | |||
| SMC | 2.96 | (0.52) | 3.05 | 0.62 | 2.99 | (0.56) | 0.09 (.16) | −0.06 (.10) | 0.03 (.06) | |||
Note. BBTi refers to Brief Behavioral Treatment of insomnia group (n = 32); SMC refers to Self-monitoring Controls (n = 30).
a
Hedges gav = within group (change) effect size. Guidelines for interpreting Hedges gav - 0.20 = small, 0.50 = moderate, 0.80 = large
b
Greenhouse-Geisser correction was applied to Group × Time interaction.
c
Guidelines for interpreting η2p: .01 = small, .06 = moderate, .14 = large (Cohen, 1977)
*
p < .05 (after Bonferroni correction)
**
p < .01 (after Bonferroni correction)
***
p < .001 (after Bonferroni correction)