Table 6.
Comparison between persistent new-onset respiratory symptoms and abnormal spirometry based upon participant lower limit of normal estimates (LLN)
|
Abnormal* spirometry |
Normal spirometry |
Predictive values | |
|---|---|---|---|
| N = 145 (%) | N = 94 (%) | ||
|
Persistent new-onset respiratory symptoms** |
82 (55.9) |
28 (38.7) |
PPV |
| 74.5% | |||
|
No pulmonary symptoms |
65 (44.1) |
45 (61.3) |
NPV |
| 59.1% | |||
| Validity measures |
Sensitivity |
Specificity |
|
| 55.8% | 61.6% |
*Abnormal spirometry FEV1, FVC, or FEV1/FVC Ratio below NHANES % predicted LLN.
**Reported symptoms were persistent new-onset cough, wheeze, shortness of breath, or chest tightness since January 2005, Graniteville chlorine spill.