Psychometric properties of a single-item scale to assess sleep quality among individuals with fibromyalgia

Table 4 Treatment differences and effect sizes for the Sleep Quality Scale

Pregabalin Dose Group	Treatment Comparison (Pregabalin – Placebo)^a			Effect Size ^a
	Difference	95% CI	p-value
Study 1056
300 mg	-0.86	-1.30, -0.43	0.0001	-0.521
450 mg	-0.97	-1.40, -0.53	<0.0001	-0.587
600 mg	-1.21	-1.64, -0.77	<0.0001	-0.732
Study 1077
300 mg	-0.73	-1.14, -0.31	0.0007	-0.458
450 mg	-1.12	-1.54, -0.71	<0.0001	-0.703
600 mg	-1.31	-1.73, -0.90	<0.0001	-0.822

CI = Confidence Interval
^aHigher Sleep Quality scores indicate poorer sleep quality. Therefore a negative difference between pregabalin and placebo and negative effect size indicates a greater improvement in sleep quality for patients receiving pregabalin relative to those receiving placebo.

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