NPPB and congestive heart failure: When only dichotomized values of BNP and LVEF were entered in the model BNP>30 pg/ml and LVEF<50% remained statistically significant for detection of CHF (BNP>30 pg/ml: HR 4.87, CI 1.55–15.36, p = 0.007 and LVEF<50%: HR 6.13, CI 2.25–16.68, p = 0.000).