chest pain : angina ruled out in 21 % vs 26 % ( n.s . ) , stable angina 64 % vs 61 % ( n.s . ) , unstable angina 15 % vs 13 % ( n.s . ) , positive non-invasive tests 39 % vs 44 % ( n.s . ) .
C0008031
chest pain
C0002962
angina