title: [Comparison of four diagnostic criteria for idiopathic inflammatory myopathy].
abstract: OBJECTIVE
  To compare the clinical values of four different criteria for diagnosing idiopathic inflammatory myopathy (IIM).
  
  
  METHODS
  The four different criteria published in 1975, 1995, 1997 and 2004 were applied to 94 IIM patients and 98 patients with other myopathies in West China Hospital.
  
  
  RESULTS
  The sensitivity of the four criteria for diagnosing IIM was 56. 4% (1975), 87. 2% (1995), 61.7 % (1997), and 52. 1% (2004) respectively. The specificity of the four criteria for diagnosing IIM was 78. 6% (1975), 20. 4% (1995), 78. 6% (1997), and 90. 8% (2004) respectively. The Youden index was 35.0% (1975), 7.6% (1995), 40. 3% (1997), and 42.9% (2004), with an odd product of 4. 74 (1975), 1. 75 (1995), 5. 91 (1997) and 10. 77 (2004) respectively. The Kappa value of the four criteria was 0. 351 (1975, P<0.05), 0. 075 (1995, P>0. 05), 0. 404 (1997, P<0.05 ) and 0. 433 (2004, P<0.05), and their area under the ROC curve was 0. 675 (1975, P=0. 00), 0. 538 (1995, P=0.36),0. 701 (1997, P=0.00) and 0. 715 (2004, P=0.00) respectively.
  
  
  CONCLUSIONS
  The 2004 criteria have a better value in diagnosing IIM.
authors: Department of Rheumatology and Immunology, West China Hospital, Sichuan University, Chengdu 610041, China.
authors: Xiao-Min
authors: XM
authors: Cen
authors: Ya-Fei
authors: YF
authors: Cai
authors: Ling
authors: L
authors: Ma
authors: Qi-Bing
authors: QB
authors: Xie
authors: Geng
authors: G
authors: Yin
authors: Chuan
authors: C
authors: Zuo
mesh_terms: D000328:Adult; D003882:Dermatomyositis / Q000175:diagnosis; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009220:Myositis / Q000145:classification / Q000175:diagnosis*; D012372:ROC Curve; D012015:Reference Standards; D012189:Retrospective Studies; D012680:Sensitivity and Specificity