Korean J Pain.  2019 Apr;32(2):120-128. 10.3344/kjp.2019.32.2.120.

Fibromyalgia diagnostic model derived from combination of American College of Rheumatology 1990 and 2011 criteria

• Ghavidel-Parsa B
• Bidari A
• Hajiabbasi A
• Shenavar I
• Ghalehbaghi B
• Sanaei O

• KMID: 2449825
• DOI: http://doi.org/10.3344/kjp.2019.32.2.120

Abstract

BACKGROUND
We aimed to explore the American College of Rheumatology (ACR) 1990 and 2011 fibromyalgia (FM) classification criteria's items and the components of Fibromyalgia Impact Questionnaire (FIQ) to identify features best discriminating FM features. Finally, we developed a combined FM diagnostic (C-FM) model using the FM's key features.
METHODS
The means and frequency on tender points (TPs), ACR 2011 components and FIQ items were calculated in the FM and non-FM (osteoarthritis [OA] and non-OA) patients. Then, two-step multiple logistic regression analysis was performed to order these variables according to their maximal statistical contribution in predicting group membership. Partial correlations assessed their unique contribution, and two-group discriminant analysis provided a classification table. Using receiver operator characteristic analyses, we determined the sensitivity and specificity of the final model.
RESULTS
A total of 172 patients with FM, 75 with OA and 21 with periarthritis or regional pain syndromes were enrolled. Two steps multiple logistic regression analysis identified 8 key features of FM which accounted for 64.8% of variance associated with FM group membership: lateral epicondyle TP with variance percentages (36.9%), neck pain (14.5%), fatigue (4.7%), insomnia (3%), upper back pain (2.2%), shoulder pain (1.5%), gluteal TP (1.2%), and FIQ fatigue (0.9%). The C-FM model demonstrated a 91.4% correct classification rate, 91.9% for sensitivity and 91.7% for specificity.
CONCLUSIONS
The C-FM model can accurately detect FM patients among other pain disorders. Re-inclusion of TPs along with saving of FM main symptoms in the C-FM model is a unique feature of this model.

Keyword

Chronic pain; Discriminant analysis; Fatigue; Fibromyalgia; Logistic models; Neck pain; Osteoarthritis; Periarthritis; Sensitivity and specificity; Shoulder pain; Sleep initiation and maintenance disorders; Survey and questionnaires

MeSH Terms

Back Pain
Chronic Pain
Classification
Discriminant Analysis
Fatigue
Fibromyalgia*
Humans
Logistic Models
Neck Pain
Osteoarthritis
Periarthritis
Rheumatology*
Sensitivity and Specificity
Shoulder Pain
Sleep Initiation and Maintenance Disorders

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