Table 1 Clinical characteristics of PM/DM patients and controls.

From: The SNPs of mitochondrial DNA displacement loop region and mitochondrial DNA copy number associated with risk of polymyositis and dermatomyositis

Group

PM/DM patients (n = 86)

Controls (n = 110)

T value

χ2

p

Age (year)

52.92 ± 14.24

55.08 ± 10.66

−1.175

–

0.242

Gender (M/F)

17/69

20/90

−

0.079

0.778

PM/DM

10/76

    

Manifestations

Muscle pain

34

–

   

Muscle weakness

51

–

   

Heliotrope rash

48

–

   

Gottron’s sign

40

–

   

Shawl and V-sign

39

–

   

ILD

48

–

   

Dysphagia

12

–

   

ANA ( +)

68

–

   

Jo-1 ( +)

6

–

   

CK (U/L)

1797.720 ± 3079.345

–

   

LDH (U/L)

562.436 ± 869.004

–

   

ESR (mm/h)

29.744 ± 23.014

–

   

CRP (mg/L)

10.962 ± 22.224

–

   
  1. PM polymyositis, DM dermatomyositis, ILD interstitial lung disease, ANA antinuclear antibody, χ2 Chi-square.
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