Table 1 Demographic and clinical data of PM and DM patients

Age at diagnosis (years)†

51.1 ± 15.8

43.7 ± 13.9

45.4 ± 14.6

Gender (F:M)

7:4

23:15

30:19

Disease duration (months)†

44.2 ± 46.9

62.9 ± 53.0

59.1 ± 51.9

Clinical manifestation, n (%)

   Fever

3 (27.3)

11 (28.9)

14 (28.6)

   Raynaud's phenomenon

2 (18.2)

6 (15.8)

8 (16.3)

   Arthralgia

2 (18.2)

14 (36.8)

16 (32.7)

   Dysphagia

0 (0)

9 (23.7)

9 (18.4)

   Cardiac involvement

2 (18.2)

0 (0)

2 (4.1)

   ILD

2 (18.2)

12 (31.6)

14 (28.6)

   Malignancy

3 (27.3)

9 (23.7)

12 (24.5)

   Myositis overlap

1 (9.1)

2 (5.3)

3 (6.1)