| Myositis diagnosis prior to inclusion | Anti-Jo-1 positivity | Myositis subtype | ||||||
---|---|---|---|---|---|---|---|---|---|
Yes (N = 54) | No (N = 14) | p value | Yes (N = 53) | No (N = 15) | p value | PM (N = 27) | DMa (N = 25) | p value | |
Age at diagnosis (years) | 47 (14.3) | 49 (11.5) | n.s. | 48 (13.9) | 43 (12.8) | n.s. | 50 (14.9) | 43 (13.7) | n.s. |
Disease duration (months) | 76 (6–362) | 22 (7–230) | 0.003 | 76 (6–362) | 35 (7–230) | 0.004 | 70 (6–362) | 83 (14–350) | n.s. |
Jo1/non-Jo1, n | 49 / 5 | 4 / 10 | <0.001 | Â | Â | Â | 25 / 2 | 23 / 2 | n.s. |
Ro-52 positivity, n/N (%) | 38/54 (70) | 7/14 (50) | n.s. | 37/53 (70) | 8/15 (53) | n.s. | 17/27 (63) | 17/25 (68) | n.s. |
CK (U/L) | 103 (38–1344) | 71 (24–194) | n.s. | 101 (38–1344) | 70 (24–572) | n.s. | 101 (43–437) | 113 (38–1344) | n.s. |
MMT14 score (0–140) | 139 (134, 140) | 136 (127, 140) | n.s. | 139 (134, 140) | 139.5 (131.5,140) | n.s. | 139 (136, 140) | 137 (134, 140) | n.s. |
MMT4 score (0–40) | 40 (36, 40) | 38.5 (34, 40) | n.s. | 39 (36, 40) | 40 (35, 40) | n.s. | 40 (37, 40) | 39 (36, 40) | n.s. |
FI2 score (0–330) | 212 (125, 297) | 194.5 (91,320) | n.s. | 221.5 (129, 304) | 185 (82, 301.5) | n.s. | 224 (87.5, 318) | 210 (129.5, 288) | n.s. |
MRI changes | |||||||||
Muscle edema score (0–36) | 7.49 (10.7) | 0.62 (1.5) | <0.001 | 7.86 (10.7) | 0.27 (1.0) | <0.001 | 0 (0–26) | 4 (0–36) | 0.039 |
Total edema score (0–42) | 8.83 (12.0) | 1.38 (2.5) | <0.001 | 9.29 (12.1) | 0.80 (2.2) | <0.001 | 6.0 (9.6) | 11.6 (13.8) | n.s. |
Total damage score (0–36) | 6.98 (5.4) | 4.15 (2.5) | 0.008 | 7.06 (5.5) | 4.27 (2.7) | 0.010 | 7.0 (5.7) | 7.1 (5.1) | n.s. |
Total MRI score (0–78) | 15.87 (14.7) | 5.54 (3.6) | <0.001 | 16.39 (14.7) | 5.13 (3.8) | <0.001 | 13.0 (13.0) | 18.8 (15.6) | n.s. |