Occurred simultaneously/initially diagnosed with myositis/scleroderma:
23/4/12
—
—
Clinical results
ILD/alveolitis (no. of patients/%):
24/71.79
36/73.47
ns
Arthritis/arthralgia (no. of patients/%):
32/82.05
43/87.76
ns
Dysphagia (no. of patients/%):
26/66.67
6/12.24
<0.0001
Intestinal involvement except dysphagia (no of patients/%)
11/28.21
5/10.2
0.03
Fever (no. of patients/%):
7/17.95
21/42.86
ns
Raynaud’s phenomenon (no. of patients/%):
38/97.44
32/65.31
<0.001
Renal involvement (no. of patients/%):
5/12.82
—
—
Cardiac involvement (no. of patients/%):
16/41.03
—
—
PAH (no. of patients/%):
12/30.77
—
—
Mechanic’s hand (no. of patients/%)
5/12.82
16/32.65
ns
Subcutaneous calcinosis (no. of patients/%)
8/20.51
3/6.12
ns
Livedo reticularis (no. of patients/%)
2/5.13
16/32.65
<0.01
Laboratory results
ns
ns
SSA positivity (no. of patients/%)
9/7.69
17/34.69
ns
<0.01
SD: standard deviation; CK: creatine kinase; LDH: lactate dehydrogenase; SSA: Sjögren’s-syndrome-related antigen A; ILD: interstitial lung disease; PAH: pulmonary arterial hypertension. Only age at diagnosis of myositis has Gaussian distribution in both groups; Welch’s -test was applied. Significance was calculated with independent samples -test or Mann–Whitney test, according to the distribution. Normality of the distributions was checked using Shapiro-Wilk test. Symptoms and laboratory parameters were compared between the two groups with Fisher’s exact test, applying Hochberg’s correction for multiple comparisons.
