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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Am J Med. 2014 Oct 15;128(2):171–180.e5. doi: 10.1016/j.amjmed.2014.09.023

Table 4.

Comparison of Receiver Operating Curves (ROC) for baseline covariates plus selected cardiopulmonary diagnostic tests in prediction of self-reported dyspnea.

Model Area Under Curve (95% CI) Improvement over baseline model (95% CI) Chi-Square P-value
Baseline modela 0.744 (0.707, 0.782) - - -
Baseline + percent predicted FEV1 0.768 (0.731, 0.806) 0.024 (0.0003, 0.047) 3.95 0.047
Baseline + percent emphysema 0.752 (0.715, 0.789) 0.008 (−0.006, 0.021) 1.289 0.256
Baseline + NT-proBNP 0.752 (0.714, 0.789) 0.007 (−0.005, 0.019) 1.434 0.231
Baseline + all three tests 0.774 (0.737, 0.812) 0.030 (0.003, 0.057) 4.665 0.031
a

Baseline model includes age, body mass index, gender, exercise, anxiety, and leg pain.

FEV1 = forced expiratory volume in one second. NT-proBNP = N-Terminal pro-Brain Natriuretic Peptide.