Table 1.
Patients’ characteristics including comorbidities, pulmonary function, and radiologic findings
| Characteristics | Group 1: M. kansasii former subtype 1 (N = 47) | Group 2: M. kansasii former subtypes 2, 3, and 6 (N = 13) | P |
|---|---|---|---|
| Age (yr), median (IQR) | 62.0 (49.3–71.2) | 63.4 (50.4–75.6) | 0.378 |
| Male, N (%) | 31 (66.0) | 8 (61.5) | 0.755 |
| Body mass index (kg/m2), median (IQR) | 21.2 (19.6–22.8) | 22.0 (20.7–22.8) | 0.385 |
| Smoking, N (%) | 26 (57.8) | 6 (46.2) | 0.535 |
| Underlying disease, N (%) | 32 (68.1) | 9 (69.2) | 1 |
| Previous history of tuberculosis, N (%) | 17 (36.2) | 8 (61.5) | 0.122 |
| Previous history of tuberculosis treatment, N (%) | 11 (23.4) | 7 (53.8) | 0.046 |
| Malignancy, N (%) | 13 (27.7) | 1 (7.7) | 0.264 |
| Diabetes Mellitus, N (%) | 10 (21.3) | 3 (23.1) | 1 |
| Chronic kidney disease, N (%) | 1 (2.1) | 0 (0) | 1 |
| Chronic liver disease, N (%) | 3 (6.4) | 0 (0) | 1 |
| Immunocompromised, N (%) | 8 (17.0) | 0 (0) | 0.182 |
| Sputum smear positivity, N (%) | 6 (12.8) | 1 (7.7) | 1 |
| FEV1 (% predicted), median (IQR) | 93.0 (79.5–102.5) | 99.0 (78.3–103.0) | 0.688 |
| FVC (% predicted), median (IQR) | 88.0 (79.0–96.5) | 97.5 (91.8–108.8) | 0.025 |
| FEV1/FVC, median (IQR) | 74.0 (70.0–81.5) | 70.5 (57.0–71.8) | 0.038 |
| Erythrocyte sediment rate (mm/h), median (IQR) | 25.0 (12.5–42.5) | 25.0 (7.0–34.8) | 0.762 |
| Radiographic characteristics, N (%) | 39 (83.0) | 11 (84.6) | 1 |
| Non-cavitary nodular bronchiectatic lesion | 16 (34.0) | 10 (76.9) | 0.010 |
| Cavitary nodular bronchiectatic lesion | 5 (10.6) | 1 (7.7) | 1 |
| Fibrocavitary lesion | 18 (38.3) | 0 (0) | 0.006 |
Abbreviations: IQR, interquartile range; FVC, forced vital capacity; FEV1, forced expiratory volume in 1 second.