We compared the incremental value of each additional assessment ( quality of life screen , laboratory testing , echocardiography , and exercise testing ) to baseline clinical assessment for predicting clinical outcomes ( all-cause mortality , all-cause mortality/hospitalization , and cardiovascular death/HF hospitalizations ) , gauging incremental improvements in prognostic ability with more information using area under the curve and reclassification improvement ( net reclassification index ) , with and without NT-proBNP availability .