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Table 2 Demographic, clinical and laboratory features in anti-MJ (+) and -MJ (-) patients.

From: Anti-MJ/NXP-2 autoantibody specificity in a cohort of adult Italian patients with polymyositis/dermatomyositis

  Anti-MJ (+)
n = 10
Anti-MJ (-)
n = 48
P 1
Demographic data    
Male 40% 23%  
Mean age, ys (± SD) 37.6 (± 12) 54.6 (± 14.8) 0.0023
DM/PM/overlap (%) 80/20/0 40/48/13 DM 0.03
Clinical and laboratory data    
Heliotrope rash 60% 19% 0.01
Calcinosis 30% 8% 0.09
Facial erythema 60% 33% ns
Gottron's papules 20% 19% ns
Arthritis 20% 8% ns
Raynaud's phenomenon 20% 27% ns
Heart involvement 0% 13% ns
Interstitial lung disease 0% 33% 0.048
Elevated CPK at last visit 0% 25% ns
  1. 1P values are by Fisher's exact test except for mean age comparison by Mann-Whitney. CPK, creatine phosphokinase; DM/PM, dermatomyositis/polymyositis; ns, not significant; SD, standard deviation.