Table 2.

Baseline Subjective Measures: Mean and SD of Pittsburgh Sleep Quality Index (PSQI) parameters at baseline

PSQI component	Study 1 (n=101)	Study 2 (n=82)	Combined (n=183)
	Mean (SD)	Mean (SD)	Mean (SD)
Subjective sleep quality*	1.24 (.81)	0.98 (.69)	1.13 (0.77)
Sleep latency	1.38 (1.01)	1.19 (1.01)	1.30 (1.01)
Duration	1.09 (0.93)	0.88 (0.80)	0.99 (0.87)
Habitual sleep efficiency	0.80 (1.01)	0.60 (0.85)	0.71 (0.95)
Sleep disturbances**	1.34 (0.54)	1.57 (0.55)	1.44 (0.55)
Use of sleep medication**	1.18 (1.32)	0.64 (1.08)	0.94 (1.24)
Daytime dysfunction	1.00 (0.61)	0.95 (0.67)	0.98 (0.63)
Global PSQI*	7.98 (4.12)	6.80 (3.64)	7.45 (3.94)

t-test of difference between cohorts:

^*p < .05;

^**p<.01