| TB(+) (n = 12) | TB(−) (n = 24) | P value |
Demographic features |
|
|
|
Age at DM/PM diagnosis (years) | 45.3 ± 14.1 | 44.7 ± 13.8 | 0.894 |
DM/PM diagnosis―symptom onset (mo) | 3.0 [2.3 - 8.5] | 4.0 [2.3 - 6.8] | 0.665 |
TB diagnosis―symptom onset (mo) | 23.0 [10.3 - 80.5] | 54.0 [6.8 - 83.5] | 0.728 |
Female gender | 9 (75.0) | 18 (75.0) | 1.000 |
White ethnicity | 10 (83.3) | 20 (83.3) | 1.000 |
Patients with DM | 9 (75.0) | 18 (75.0) | 1.000 |
Patients with PM | 3 (25.0) | 6 (25.0) | 1.000 |
Initial and cumulative features |
|
|
|
Constitutional symptoms | 9 (75.0) | 13 (54.2) | 0.292 |
Heliotrope rash and/or Gottron’s papules | 9 (75.0) | 18 (75.0) | 1.000 |
Muscle strength |
|
|
|
Upper limbs | IV [IV - IV] | IV [IV - IV] | 0.631 |
Lower limbs | IV [IV - IV] | IV [IV - IV] | 0.882 |
Upper dysphagia | 4 (33.3) | 12 (50.0) | 0.298 |
Joint involvement | 9 (75.0) | 9 (37.5) | 0.075 |
Pulmonary involvement | 9 (75.0) | 10 (41.7) | 0.083 |
Incipient pneumonia | 5 (41.7) | 7 (29.2) | 0.479 |
Pulmonary ground-glass opacity | 6 (50.0) | 5 (20.8) | 0.124 |