Table 2. Laboratory Findings of All Patients at the Time of Diagnosis.
| Parameter | Myositis autoantibody (+) | Myositis autoantibody (-) | p value | ||
|---|---|---|---|---|---|
| No. of patients | Results | No. of patients | Results | ||
| WBC (103/uL) | 12 | 8140 [6020-9890] | 19 | 8250 [6360-9055] | 0.598 |
| ESR (mm/hr) | 12 | 38.0 [19.5-47.0] | 15 | 29.0 [13.7-63.5] | 0.769 |
| CRP (mg/dL) | 12 | 0.38 [0.07-0.70] | 17 | 0.32 [0.06-0.60] | 0.722 |
| LD (IU/L) | 12 | 473.0 [427.5-592.5] | 16 | 380.0 [298.7-475.0] | 0.046 |
| CK (IU/L) | 11 | 70 [59.2-136.0] | 16 | 82.0 [40.7-117.0] | 0.572 |
| RF (n) | 12 | 3 (25.0) | 20 | 4 (20.0) | 0.912 |
| PaO2 (mm Hg) | 10 | 85.7 [79.8-88.2] | 9 | 93.1 [86.8-95.3] | 0.060 |
| PFT | |||||
| FVC (%Pred.) | 10 | 60.0 [54.0-73.0] | 18 | 74.5 [64.0-87.0] | 0.037 |
| DLCO (%Pred.) | 8 | 45.0 [42.0-55.0] | 15 | 66.0 [55.0-75.2] | 0.008 |
| TLC (%Pred.) | 9 | 57.0 [54.7-73.0] | 15 | 81.0 [64.2-94.7] | 0.007 |
| FANA (%) | 12 | 8 (66.7) | 20 | 14 (70) | 0.843 |
| ANCA (%) | 7 | 1 (14.3) | 14 | 7 (50) | 0.266 |
WBC, white blood cell; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; LD, lactate dehydrogenase; CK, creatine kinase; RF, rheumatoid factor; PaO2, blood gas analysis for partial pressure of oxygen in arterial blood; PFT, pulmonary function test; FVC, forced vital capacity; DLCO, diffusing capacity for carbon monoxide; TLC, total lung capacity; Pred., predicted; FANA, fluorescent antinuclear antibody test; ANCA, anti-neutrophil cytoplasmic antibody.
Values are expressed as median [25-75 percentiles] or number of data (percentage). RF normal value: <14 IU/mL, n: the number of available cases.