Table 2 Qualitative parameters of 99mTc-PYP muscular uptake in patients with polymyositis or dermatomyositis and control persons
Upper limbs | Lower limbs | |||||
A. First observation | ||||||
All patients (N = 87) | Controls (N = 48) | p value | All patients (N = 85) | Controls (N = 47) | p value | |
Intensity score | ||||||
1 | 24 (28) | 34 (71) | < 0.0001 | 14 (16) | 22 (47) | < 0.0001 |
2 | 34 (39) | 10 (21) | 50 (59) | 24 (51) | ||
3 | 23 (26) | 4 (8) | 17 (20) | 1 (2) | ||
4 | 6 (7) | 0 (0) | 4 (5) | 0 (0) | ||
Patchy pattern | ||||||
Yes | 21 (24) | 3 (6) | 0.01 | 19 (22) | 3 (6) | 0.03 |
No | 66 (76) | 45 (94) | 66 (78) | 44 (94) | ||
Symmetry | ||||||
Yes | 71 (82) | 45 (94) | 0.07 | 70 (82) | 44 (94) | 0.11 |
No | 16 (18) | 3 (6) | 15 (18) | 3 (6) | ||
B. Second observation | ||||||
All patients (N = 25) | Controls (N = 25) | p value | All patients (N = 25) | Controls (N = 25) | p value | |
Intensity score | ||||||
1 | 7 (28) | 19 (76) | < 0.0001 | 8 (32) | 19 (76) | < 0.0001 |
2 | 3 (12) | 3 (12) | 5 (20) | 6 (24) | ||
3 | 6 (24) | 3 (12) | 7 (28) | 0 (0) | ||
4 | 9 (36) | 0 (0) | 5 (20) | 0 (0) | ||
Patchy pattern | ||||||
Yes | 0 (0) | 1 (4) | 1.00 | 0 (0) | 0 (0) | 1.00 |
No | 25 (100) | 24 (96) | 25 (100) | 25 (100) | ||
Symmetry | ||||||
Yes | 25 (100) | 24 (96) | 1.00 | 25 (100) | 25 (100) | 1.00 |
No | 0 (0) | 1 (4) | 0 (0) | 0 (0) | ||