Multidimensional daily diary of fatigue-fibromyalgia-17 items (MDF-fibro-17): part 2 psychometric evaluation in fibromyalgia patients

Table 7 Scores by GFI, FIQ-Total, and Pain NRS Quintiles

MDF-Fibro-17 Scores	Q1	Q2	Q3	Q4	Q5	F Value	Probability F
Tests of Known-groups Validity by GFI Quintile
Total	4.02	4.94	5.59	6.42	7.19	84.37	<0.001
Global Fatigue Experience	4.38	5.52	6.02	6.78	7.48	88.67	<0.001
Cognitive Fatigue	3.23	4.02	4.76	5.71	6.47	48.02	<0.001
Physical Fatigue	4.71	5.47	5.90	6.76	7.37	53.77	<0.001
Motivation	3.93	4.91	5.71	6.55	7.53	86.88	<0.001
Impact on Function	3.82	4.77	5.54	6.30	7.08	74.76	<0.001
Tests of Known-groups Validity by FIQ-Total Quintile
Total	3.99	5.01	5.69	6.26	7.23	81.63	<0.001
Global Fatigue Experience	4.48	5.51	6.07	6.64	7.52	77.75	<0.001
Cognitive Fatigue	3.17	4.30	4.82	5.39	6.54	43.89	<0.001
Physical Fatigue	4.57	5.37	6.15	6.71	7.44	67.05	<0.001
Motivation	3.93	5.06	5.80	6.41	7.45	73.08	<0.001
Impact on Function	3.80	4.82	5.61	6.14	7.18	77.70	<0.001
Tests of Known-groups Validity by Pain NRS Quintiles
Total	4.35	4.97	5.57	6.33	7.13	53.58	<0.001
Global Fatigue Experience	4.69	5.38	5.97	6.75	7.58	72.11	<0.001
Cognitive Fatigue	3.65	4.20	4.80	5.52	6.18	23.90	<0.001
Physical Fatigue	4.74	5.41	6.00	6.61	7.65	64.24	<0.001
Motivation	4.44	5.06	5.64	6.51	7.20	39.74	<0.001
Impact on Function	4.22	4.80	5.42	6.26	7.03	47.41	<0.001

FIQ Fibromyalgia Impact Questionnaire, GFI Global Fatigue Index from the MAF, MDF-Fibro-17 Multidimensional Daily Diary of Fatigue-Fibromyalgia-17, NRS Numeric Rating Scale, Q quintile