Table 4.

Change in ESS Total Scores over 6 Months

	LS Mean Change From Baseline
	Placebo (n = 349)	Zolpidem Extended-Release 12.5 mg n = 667)	P
Month 1	−1.1	−1.5	0.0943
Month 2	−1.2	−2.0	0.0004
Month 3	−1.3	−2.3	0.0002
Month 4	−1.5	−2.4	0.0007
Month 5	−1.8	−2.5	0.0167
Month 6	−2.0	−2.3	0.3137

ESS = Epworth Sleepiness Scale; LS = least squares.

ESS maximum score = 24; minimum = 0.

The increasing negative values indicate increasing improvement from baseline.