Clinical Features of Dermatomyositis/Polymyositis with Anti-MDA5 Antibody Positivity

Table 4

Comparison of treatment regimens between the positive and negative groups (n (%)).

	Positive anti-MDA5 antibody (n = 18)	Negative anti-MDA5 antibody (n = 46)	χ ^2	P
Treatment 1	8 (44.4)	15 (32.6)	0.222	0.637
Treatment 2	10 (55.6)	22 (47.8)	4.500	0.034
Treatment 3	0	9 (19.6)	9.000	0.002

Note. Chi-square test; Treatment 1: methylprednisolone ≥ 60 mg/d + immunosuppression; Treatment 2: methylprednisolone < 60 mg/d (or oral equivalent prednisone) + immunosuppression; Treatment 3: hormones only without combined immunosuppression.