Table 4: Spearman’s rank correlation coefficient of muscle biopsy score with clinical and laboratory variables.
| Biopsy score |
Correlation coefficient |
| Muscle power |
CK |
ESR |
| Total group |
(n=95) |
(n=95) |
(n=64) |
| Prior CS |
(n=70) |
(n=70) |
(n=44) |
| 1. Inflammation |
|
|
|
| Total group |
−0.03 |
0.13 |
0.19 |
| Prior CS |
-0.14 |
0.16 |
0.05 |
| 2. Vasculitis |
|
|
|
| Total group |
0.06 |
-0.08 |
0.09 |
| Prior CS |
0.04 |
-0.17 |
0.04 |
| 3. Muscle |
|
|
|
| Atrophy |
|
|
|
| Total group |
-0.05 |
0.00 |
0.06 |
| Prior CS |
-0.03 |
0.05 |
0.09 |
| Degenerative |
|
|
|
| Total group |
-0.23* |
0.27** |
-0.09 |
| Prior CS |
-0.23 |
0.38** |
-0.25 |
| Invaded non-necrotic fiber |
|
|
|
| Total group |
-0.08 |
0.27** |
0.06 |
| Prior CS |
-0.18 |
0.32** |
-0.25 |
| 4. Endomysial fibrosis |
|
|
|
| Total group |
-0.24* |
0.39** |
-0.11 |
| Prior CS |
-0.25* |
0.51** |
-0.16 |
| Total biopsy score |
|
|
|
| Total group |
-0.14 |
0.24* |
0.05 |
| Prior CS |
-0.14 |
0.33** |
-0.07 |
CK=creatine kinase, ESR=Erythrocyte sedimentation rate
*p<0.05, ** p<0.01
Prior CS=underwent biopsy prior using corticosteroid; After CS=underwent biopsy after using corticosteroid.