Table 1.

Clinical characteristics between anti‐MDA5 and antibody‐negative DM groups.

Criterion	Anti‐MDA5	Antibody negative DM	P‐value
Female, n (%)	9 (82)	7 (70)	0.635
Age of onset, years	52.1 ± 8.7	53.1 ± 14.5	0.847
Disease duration, months	4.1 ± 3.1	5.9 ± 4.6	0.296
Skin ulcers, n (%)	8 (73)	0	0.001 *
Interstitial lung disease, n (%)	11 (100)	2 (20)	<0.001 *
MMT8 scores	71.3 ± 6.1	63.2 ± 8.4	0.020 *
CK level, IU/L	185.2 ± 209.1	2149.1 ± 2677.4	0.036 *

Bold indicates the data that had significant difference after pairwise comparison.

MMT, manual muscle test; CK, creatine kinase.

^* P < 0.05.