Volume 17, Number 3—March 2011
Dispatch
Distinguishing Tuberculosis from Nontuberculous Mycobacteria Lung Disease, Oregon, USA
Table 2
PPVs of patient characteristics for tuberculosis in Oregon, USA, an area of low tuberculosis incidence, 2005–2006*
| Variable | No. patients | No. TB cases | PPV for TB (95% CI) |
|---|---|---|---|
| Age <50 y, not US born | 44 | 43 | 0.98 (0.88–1.00) |
| Age >50 y, US born, COPD | 12 | 1 | 0.08 (0.00–0.38) |
| COPD | 31 | 2 | 0.06 (0.01–0.21) |
| Age <50 y | 70 | 49 | 0.70 (0.58–0.80) |
| Not US born | 80 | 65 | 0.81 (0.71–0.89) |
| Infiltrate | 137 | 68 | 0.50 (0.41–0.58) |
| Constitutional symptoms | 117 | 56 | 0.48 (0.39–0.57) |
*PPV using all patients (n = 207); tuberculosis cases = 80. PPV, positive predictive value; TB, tuberculosis; CI, confidence interval; COPD, chronic obstructive pulmonary disease.


