. Author manuscript; available in PMC: 2012 May 23.

Published in final edited form as: Arch Intern Med. 2011 Jan 24;171(10):887–895. doi: 10.1001/archinternmed.2010.535

Table 5.

Polysomnography Measures

	BBTI		IC

Characteristic	Pretreatment/ Posttreatment, Mean (SD)	Difference (SE) [95% CI]	Pretreatment/ Posttreatment, Mean (SD)	Difference (SE) [95% CI]	BBTI−IC Difference (SE) [95% CI], Cohen d Effect Size
Sleep latency, min	22.49 (4.81)/29.21 (4.81)	6.72 (5.70) [−4.64 to 18.07]	25.84 (4.69)/25.59 (4.74)	−0.25 (5.58) [−11.36 to 10.87]	6.96 (7.98) [−8.93 to 22.85], 0.20
Wake after sleep onset, min	102.12 (8.77)/85.26 (8.49)	−16.86 (8.30) [−33.40 to −0.32]	90.22 (8.58)/92.46 (8.38)	2.23 (8.11) [−13.91 to 18.38]	−19.09 (11.61) [−42.20 to 4.02], 0.38
Total sleep time, min	350.12 (8.83)/324.82 (9.43)	−25.30 (10.17) [−45.55 to −5.05]	351.12 (8.63)/333.31 (9.31)	−17.81 (9.95) [−37.63 to 2.00]	−7.49 (14.23) [−35.82 to 20.85], 0.12
Sleep efficiency, %	74.38 (1.82)/74.86 (1.67)	0.48 (1.57) [−2.65 to 3.61]	75.67 (1.78)/74.16 (1.64)	−1.51 (1.53) [−4.57 to 1.54]	2.00 (2.20) [−2.38 to 6.37], 0.21

Abbreviations: BBTI, brief behavioral treatment for insomnia; CI, confidence interval; IC, information control.