Table 4.

Comparing CBTI vs SRT vs sleep hygiene education on objective sleep parameters.

	Pretreatment Group Comparisons	Posttreatment Group Comparisons	6-month Follow-up Group Comparisons
Sleep latency	F(2,110)=.15, p=.86	F(2,108)=1.82, p=.17	F(2, 108)=1.02, p=.36
SHE	12.45±17.33 m	11.66±16.78 m	8.77±6.83 m
SRT	12.35±12.21 m	6.38±5.30 m	10.44±11.23 m
CBTI	10.88±8.92 m	13.37±20.91 m	12.22±12.75 m
Wake after sleep onset	F(2,110)=1.09, p=.34	F(2,108)=.24, p=.79	F(2, 108)=1.58, p=.21
SHE	81.82±42.95 m	70.80±39.54 m	77.77±51.04 m
SRT	84.25±.51.15m	64.17±29.83 m	58.54±32.94 m
CBTI	67.97±37.15 m	68.06±54.26 m	68.34±51.95 m
Sleep efficiency	F(2,11)=1.02, p=.36	F(2,108)=.64, p=.56	F(2, 108)=1.28, p=.28
SHE	80.58±9.88	82.74±10.16	82.01±10.58
SRT	80.01±10.94	85.31±6.34	85.71±7.15
CBTI	83.20±8.94	83.08±13.61	83.25±11.78
Total sleep time	F(2,110)=.62, p=.54	F(2,108)=.62, p=.54	F(2, 108)=1.43, p=.24
SHE	388.92±45.98 m	397.46±48.97 m	394.38±50.65 m
SRT	385.84±52.23 m	409.68±30.42 m	413.25±33.62 m
CBTI	397.82±41.72 m	399.43±65.19 m	400.74±57.20 m

Note: SHE = sleep hygiene education control. SRT = sleep restriction therapy. CBTI = cognitive behavioral therapy for insomnia. PSG = polysomnography. m = minutes. Sleep latency = minutes from lights out to first epoch of sleep. Wake after sleep onset = minutes awake post sleep onset. Sleep efficiency = proportion of time in bed spent asleep X 100. Total sleep time = minutes spent asleep during total PSG recording. F = F-statistic for one-way analysis of variance to compare means across SHE, SRT, and CBTI groups. p = significance vale.