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Table 1 Demographic and clinical features of PM/DM patients and healthy controls

From: Expression of tumor necrosis factor-like weak inducer of apoptosis and fibroblast growth factor-inducible 14 in patients with polymyositis and dermatomyositis

  PM/DM patients Healthy controls
Age of onset, mean ± SD (range) years 50.6 ± 17.4 (21.5 to 75.0) 51.4 ±9.4 (27 to 70)
Number of females/number of males 77/21 27/10
Number of PM patients/number of DM patients 41/57 NA
Duration of disease, mean ± SD (range) years 5.3 ± 7.6 (1.3 to 28.0) NA
Clinical features, number of patients affected (% of cohort)   
  Interstitial lung disease 50 (51.0%) NA
  Oropharyngeal dysphagia 35 (35.7%) NA
  Raynaud’s phenomenon 20 (20.4%) NA
  Mechanic’s hands 12 (12.2%) NA
  Arthritis 45 (45.9%) NA
Anti-Jo-1-positive at time of blood sampling 20 (20.4%) NA
Levels of creatine kinase at initial visit, mean ± SD 1437.2 ± 1536.5 NA
  1. PM, polymyositis; DM, dermatomyositis; NA, not applicable.