title: The impact of fibromyalgia on health status according to the types, demographic background and pain index.
abstract: OBJECTIVE
  To compare fibromyalgia (FM) core symptoms, FM impact severity and health status between the recently defined type A and type B of fibromyalgia. To compare disease impact and health status between FM patients and non-FM chronic pain control group. Finally, to compare health related quality of life and disease symptom severity by demographic background and widespread pain index (WPI).
  
  
  METHODS
  A total of 284 consecutive FM patients and 96 non-FM control patients were enrolled. The information of four questionnaires including the Fibromyalgia Survey Questionnaire (FSQ), the Fibromyalgia Impact Questionnaire (FIQ), the 12-item Short Form Health Survey (SF-12) and questionnaires regarding demographic features were collected from a local FM registry.
  
  
  RESULTS
  Of all FM patients, 102 (94%) and 7 (6%) were type A and B, respectively. We found statistically significant differences in symptomatology, the FIQ scores and the SF-12 subscales across two type and control groups (p<0.001). However, when we compared these scores pairwise, except WPI there were no significant differences in other scores between type A and B. Also, there were no significant differences in FIQ and SF-12 scores across different age or educational status groups. Interestingly, patients with higher WPI had significantly higher FIQ (overall, symptom, and total) scores, worse PCS-12 and MCS-12 scores, and vice versa.
  
  
  CONCLUSIONS
  Type B constitutes a minor but important component of FM that probably has a marked impact on the patient's perceived illness severity and quality of life. Further, WPI probably is the most important single indicator of disease severity and quality of life in FM.
authors.affiliation: Rheumatology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Banafsheh
authors.initials: B
authors.lastname: Ghavidel-Parsa
authors.affiliation: Department of Rheumatology, Iran University of Medical Sciences, Tehran, Iran. bidari.a@iums.ac.ir.
authors.forename: Ali
authors.initials: A
authors.lastname: Bidari
authors.affiliation: Student Research Center, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Alireza A
authors.initials: AA
authors.lastname: Maafi
authors.affiliation: Student Research Center, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Amir
authors.initials: A
authors.lastname: Hassankhani
authors.affiliation: Rheumatology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
authors.forename: Asghar
authors.initials: A
authors.lastname: Hajiabbasi
authors.affiliation: Mental Health Research Group, Health Metrics Research Center, Iranian Institute for Health Sciences Research, Academic Center for Education, Culture & Research, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Montazeri
authors.affiliation: Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran.
authors.forename: Omid
authors.initials: O
authors.lastname: Sanaei
authors.affiliation: Otolaryngology and Head and Neck Surgery Research Center, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Babak
authors.initials: B
authors.lastname: Ghalehbaghi
mesh_terms: D000328:Adult; D000368:Aged; D059350:Chronic Pain / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology / Q000523:psychology; D003710:Demography; D005260:Female; D005356:Fibromyalgia / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology / Q000523:psychology; D054624:Health Status Disparities; D006306:Health Surveys; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods / Q000706:statistics & numerical data; D011788:Quality of Life; D012720:Severity of Illness Index; D063189:Symptom Assessment