Development of a self-reporting tool to obtain a Combined Index of Severity of Fibromyalgia (ICAF*)

Table 1 Exploratory factor analysis; factor loadings by instruments used.

Key: Factor loadings by each group of items. HADs_ANX_short: items 2,4,12 from the Hospital Anxiety and Depression Scales, HADs_DEPRE_short: 1,5,13, GHQ_ANX_SLEEP_short: 10,11,13,14 from the Goldberg Health Questionnaire-28, GHQ_SOCIAL_DISF_short: 17,18,21, GHQ_DEPRE_short: 24,25,27,28, SQS: Scale of Quality of Sleep, FIQ_short: 4,6,7 from Fibromyalgia Impact Questionnaire, FHAQ_short: 1,10,13,19,20 from the Health Assessment Questionnaire, FAS_PHYSICAL: 1,3,5,6 from the Fatigue Assessment Scale, BPI_PAIN_short: 2,3 from the Brief Pain Inventory, ASES_short: 1,2,6,7 from the Arthritis Self-Efficacy Scale, Coping: 14,23,27,49 from the Chronic Pain Coping Inventory, Persistence: 4, 28,34,51,63, Relaxation: 1,12,59, External_Support: 9,16,44,57, Avoidance: 15,33,41, 42, Resting: 47,58

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