Table 3.

Summary of correlations between questionnaire scores.

Questionnaire comparison	Baseline	Endpoint	Change
FIQ global versus VASFIQ, ρ	0.94	0.97	0.97
PGIC versus FIQ global, ρ	n/a	n/a	0.61
PGIC versus VASFIQ, ρ	n/a	n/a	0.58
MAF-GFI versus VASfatigue, ρ	0.67	0.76	0.64
HADS-A versus VASanxiety, ρ	0.64	0.67	0.47
HADS-D versus VASdepression, ρ	0.57	0.62	0.43
SPI versus VASsleep, ρ	0.50	0.67	0.57

FIQ, Fibromyalgia Impact Questionnaire; HADS-A, Hospital Anxiety and Depression Scale — Anxiety subscale; HADS-D, Hospital Anxiety and Depression Scale — Depression subscale; MAF-GFI, Multidimensional Assessment of Fatigue — Global Fatigue Index; n/a, not applicable; PGIC, Patient Global Impression of Change; SPI, Medical Outcomes Study Sleep Problems Index II; VAS, visual analog scale.