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Clinical Characteristics of Fibromyalgia in a Chronic Pain Population
Author(s) -
Gostine Mark,
Davis Fred,
Roberts Bradley A.,
Risko Rebecca,
Asmus Michael,
Cappelleri Joseph C.,
Sadosky Alesia
Publication year - 2018
Publication title -
pain practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 58
eISSN - 1533-2500
pISSN - 1530-7085
DOI - 10.1111/papr.12583
Subject(s) - medicine , fibromyalgia , physical therapy , medical diagnosis , chronic pain , population , logistic regression , retrospective cohort study , anxiety , pathology , environmental health , psychiatry
Objective To compare fibromyalgia ( FM ) characteristics among patients identified in a community‐based chronic pain cohort based on traditional International Classification of Diagnoses 9th revision ( ICD ‐9) diagnostic coding, with that of patients identified using a novel predictive model. Methods This retrospective study used data collected from July 1999 to February 17, 2015, in multiple chronic pain clinics in the United States. Patients were assigned to the FM case group based on specific inclusion criteria using ICD ‐9 codes or, separately, from results of a novel FM predictive model that was developed using random forest and logistic regression techniques. Propensity scoring (1:1) matched FM patients (cases) to nonmalignant chronic pain patients without FM (controls). Patient‐reported measures (eg, pain, fatigue, quality of sleep) and clinical characteristics (ie, comorbidities, procedures, and regions of pain) were outcomes for analysis. Results Nine ICD ‐9 clinical modification diagnoses had odds ratios with large effect sizes (Cohen's d > 0.8), demonstrating the magnitude of the difference between the FM and matched non‐ FM cohorts: chronic pain syndrome, latex allergy, muscle spasm, fasciitis, cervicalgia, thoracic pain, shoulder pain, arthritis, and cervical disorders (all P < 0.0001). Six diagnoses were found to have a moderate effect size (Cohen's 0.5 < d > 0.8): cystitis, cervical degeneration, anxiety, joint pain, lumbago, and cervical radiculitis. Conclusions The identification of multiple comorbidities, diagnoses, and musculoskeletal procedures that were significantly associated with FM may facilitate differentiation of FM patients from other conditions characterized by chronic widespread pain. Predictive modeling may enhance identification of FM patients who may otherwise go undiagnosed.