title: The Spanish version of the 2010 American College of Rheumatology Preliminary Diagnostic Criteria for fibromyalgia: reliability and validity assessment.
abstract: OBJECTIVE
  To investigate the reliability and validity of the Spanish version of the 2010 American College of Rheumatology (ACR) Preliminary Diagnostic Criteria for Fibromyalgia (FM) in patients with chronic pain.
  
  
  METHODS
  The 2010 ACR Preliminary Diagnostic Criteria for FM were adapted to a Spanish version following the guidelines of the Rheumatology Spanish Society Study Group of FM. Based on the 1990 ACR classi cation criteria for FM, patients with chronic pain were initially divided into two groups: a FM group and another group of non-FM individuals. Patients from the FM group were evaluated by tender points (TP) examination, Fibromyalgia Impact Questionnaire (FIQ), Widespread Pain Index (WPI), and Symptom Severity Scale (SSS). The non-FM (control) group included patients with rheumatoid arthritis (RA) and osteoarthritis (OA). They were evaluated by WPI and SSS.
  
  
  RESULTS
  We included 1,169 patients divided into two groups: FM group (n=803; 777 women and 26 men) and non-FM group (n= 366; 147 patients with RA, and 219 with OA). The median value of TP and FIQ in the FM group was 16 and 74 respectively. The preliminary 2010 ACR criteria were met by 665 (82.8%) FM patients and by 112 (30.6%) patients from the non-FM group (p<0.0001). Statistically signi cant differences in the number of TP (p<0.03), FIQ (p<0.0001), WPI (p<0.0001) and SSS (p<0.0001) were observed when FM patients fulfilling the 2010 ACR criteria were compared with the remaining FM patients who did not fulfill these criteria. Sensitivity of the Spanish version of the 2010 ACR criteria was 85.6% (95%CI: 83.1-88.1), speci city 73.2% (95%CI: 68.4-78), positive predictive value 87.7% (95%CI: 85.3-90.1) and negative predictive value 69.4% (95%CI: 64.5-74.2).
  
  
  CONCLUSIONS
  Our results indicate that the 2010 ACR Preliminary Diagnostic Criteria for FM may be useful to establish a diagnosis of FM in Spanish individuals with chronic pain.
authors.affiliation: Rheumatology Division, Clínica de Especialidades Cantabria, IDIVAL, Santander, Spain.
authors.forename: Benigno
authors.initials: B
authors.lastname: Casanueva
authors.affiliation: Rheumatology Division, CIMA Hospital, Barcelona, Spain.
authors.forename: Ferrán
authors.initials: F
authors.lastname: García-Fructuoso
authors.affiliation: Rheumatology Division, 9 de Octubre Hospital, Valencia, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: Belenguer
authors.affiliation: Rheumatology Division, Vall D'Hebron Hospital, Barcelona, Spain.
authors.forename: Cayetano
authors.initials: C
authors.lastname: Alegre
authors.affiliation: Rheumatology Division, Vall D'Hebron Hospital, Barcelona, Spain.
authors.forename: José V
authors.initials: JV
authors.lastname: Moreno-Muelas
authors.affiliation: Division of Internal Medicine, Hospital Universitario Marqués de Valdecilla, RETICEF, IDIVAL, Santander, Spain.
authors.forename: José L
authors.initials: JL
authors.lastname: Hernández
authors.affiliation: Rheumatology Division, Hospital Universitario Marqués de Valdecilla, IDIVAL, Santander, Spain.
authors.forename: Tinitario
authors.initials: T
authors.lastname: Pina
authors.affiliation: Rheumatology Division, Hospital Universitario Marqués de Valdecilla, IDIVAL, Santander, Spain. miguelaggay@hotmail.com.
authors.forename: Miguel Á
authors.initials: MÁ
authors.lastname: González-Gay
mesh_terms: D000328:Adult; D059350:Chronic Pain / Q000209:etiology / Q000523:psychology; D003430:Cross-Sectional Studies; D003469:Culture; D005260:Female; D005356:Fibromyalgia / Q000150:complications / Q000175:diagnosis / Q000503:physiopathology / Q000523:psychology; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care / Q000379:methods; D010147:Pain Measurement / Q000379:methods / Q000592:standards; D011788:Quality of Life; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013030:Spain / Q000453:epidemiology; D011795:Surveys and Questionnaires / Q000592:standards; D063189:Symptom Assessment / Q000379:methods / Q000592:standards; D014177:Translations