Table 2

Correlation between PGIC and change (Δ) in disease severity measures

Parameter	Statistic	PGIC	Δ Pain	Δ PGA	Δ Body Map	Δ FIQ	Δ HAQ	Δ MPQ
PGIC	r	1.000	−0.387	−0.327	−0.287	−0.423	−0.343	−0.250
PGIC	p Value		<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
Δ Pain	r	−0.387	1.000	0.565	0.270	0.543	0.361	0.322
Δ Pain	p Value	<0.001		<0.001	<0.001	<0.001	<0.001	<0.001
Δ PGA	r	−0.327	0.565	1.000	0.333	0.531	0.426	0.338
Δ PGA	p Value	<0.001	<0.001		<0.001	<0.001	<0.001	<0.001
Δ Body Map	r	−0.287	0.270	0.333	1.000	0.316	0.255	0.327
Δ Body Map	p Value	<0.001	<0.001	<0.001		<0.001	<0.001	<0.001
Δ FIQ	r	−0.423	0.543	0.531	0.316	1.000	0.314	0.413
Δ FIQ	p Value	<0.001	<0.001	<0.001	<0.001		<0.001	<0.001
Δ HAQ	r	−0.343	0.361	0.426	0.255	0.314	1.000	0.241
Δ HAQ	p Value	<0.001	<0.001	<0.001	<0.001	<0.001		<0.001
Δ MPQ	r	−0.250	0.322	0.338	0.327	0.413	0.241	1.000
Δ MPQ	p Value	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001

FIQ, Fibromyalgia Impact Questionnaire; HAQ, Health Assessment Questionnaire; MPQ, McGill Pain Questionnaire; PGA, Pain Global Assessment; PGIC, Patient Global Impression of Change.