Table 2.

Frequencies of RP-ILD among patients with different MSAs.

MSAs	Cases	RP-ILD	Chronic ILD	P value*
Total	333	180(54.1)	153(45.9)
Anti-MDA5	175	110(62.9)	65(37.1)	0.001
Anti-ARS	158	70(44.3)	88(55.7)	0.001
Jo-1	79	34(43.0)	45(57.0)	0.024
PL-7	35	19(54.3)	16(45.7)	0.977
PL-12	17	6(35.3)	11(64.7)	0.111
EJ	27	11(40.7)	16(59.3)	0.148

MSAs, myositis specific autoantibodies. *indicated that the results were certain MSA positive group comparison with negative group.