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Table 6 Comparison between persistent new-onset respiratory symptoms and abnormal spirometry based upon participant lower limit of normal estimates (LLN)

From: Respiratory symptoms and lung function 8–10 months after community exposure to chlorine gas: a public health intervention and cross-sectional analysis

  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%
  1. *Abnormal spirometry FEV1, FVC, or FEV1/FVC Ratio below NHANES % predicted LLN.
  2. **Reported symptoms were persistent new-onset cough, wheeze, shortness of breath, or chest tightness since January 2005, Graniteville chlorine spill.