Table 1.

Demographic and baseline data for subjects with primary insomnia who received CBT or PC

	CBT (n = 16)	PC (n = 14)
	7 men	5 men
Sex	10 women	8 women
Age, y	54.1 (11.5)	55.8 (9.9)
Baseline mean sleep-diary data
SOL, min	24.9 (16.1)	22.8 (16.2)
WASO, min	97.3 (46.2)	115.2 (52.3)
TST, min	361.1 (44.8)	350.8 (66.7)
Sleep efficiency, %	75.9 (9.9)	71.8 (11.4)
Sleep quality, score	2.9 (0.6)	2.9 (0.5)
TIB, min	470.4 (49.2)	489.1 (49.7)
Baseline polysomnographic data
SOL, min	16.5 (11.1)	17.0 (15.5)
WASO, min	95.5 (44.9)	109.3 (48.6)
TST, min	360.9 (81.5)	348.4 (79.3)
Sleep efficiency, %	78.5 (10.6)	72.7 (12.7)

Data are presented as mean (SD), except sex, which is shown as a number.

CBT refers to cognitive behavioral therapy; PC, placebo-controlled condition; SOL, sleep-onset latency; WASO, wake time after sleep onset; TST, total sleep time; TIB, time in bed.

There were no significant differences between groups on any of these variables.