TABLE 6.
PROBABILITY OF IDIOPATHIC PULMONARY FIBROSIS SCORES* AND THEIR CORRESPONDING TEST CHARACTERISTICS FOR THE PRESENCE OF IDIOPATHIC PULMONARY FIBROSIS CALCULATED FROM A PATIENT'S AGE AND AVERAGE HIGH-RESOLUTION COMPUTED TOMOGRAPHY INTERSTITIAL SCORE
| Score | PPV | Specificity | Sensitivity | NPV |
|---|---|---|---|---|
| 0 | 72 | 0 | 100 | NA |
| 0.1 | 73 | 5 | 99 | 67 |
| 0.2 | 77 | 26 | 96 | 71 |
| 0.3 | 86 | 65 | 83 | 61 |
| 0.4 | 96 | 95 | 45 | 40 |
| 0.5 | 100 | 100 | 3 | 29 |
| ≥0.6 | 100 | 100 | 1 | 28 |
*
Score = [(0.084 × Age + 2.346 × HRCT interstitial score − 3.31)/5.856] (truncate negative values as 0; positive values >1 as 1)
Definition of abbreviations: NA = not applicable; NPV = negative predictive value; PPV = positive predictive value.