Table 1.

Comparison of clinical characteristics between patients with or without ulceration of Gottron sign. Values are mean ± SD or %.

Characteristics	Patients without Ulceration, n = 68	Patients with Ulceration, n = 15	p
Age, yrs	56.3 ± 15.2	50.9 ± 13.3	0.21
CADM	31	80	0.001^**
Heliotrope rash	43	67	0.09
Fever	53	73	0.15
Arthralgia/arthritis	49	73	0.08
ILD	66	100	0.005^**
AIP/SIP	29	27	0.4
Malignancy	29	0	0.016^*
CK, IU/l	2424 ± 4189	156 ± 162	0.04^*
LDH, IU/l	564 ± 316	462 ± 252	0.25
AST, IU/l	134 ± 148	99 ± 69	0.38
WBC, × 10³/mm³	7.8 ± 3.8	5.2 ± 1.2	0.009^**
ESR, mm/h	41 ± 28, n = 56^†	48 ± 25, n = 12^†	0.4
Serum ferritin, ng/ml	650 ± 1056, n = 47^†	469 ± 419, n = 9^†	0.95
Anti-Jo1 antibody	12	0	0.19
ANA, ≥ 160×	43	7	0.006^**
Death from AIP/SIP within 1 yr	9	7	0.81

↵* p < 0.05.
↵** p < 0.01.
↵† No. patients in whom ESR or serum ferritin was tested. CADM: clinically amyopathic dermatomyositis; ILD: interstitial lung disease; AIP: acute interstitial pneumonia; SIP: subacute interstitial pneumonia; CK: creatine kinase; LDH: lactate dehydrogenase; AST: aspartate aminotransferase; WBC: white blood cell count; ESR: erythrocyte sedimentation rate; ANA: antinuclear antibody.