Patient selection: acute ST-segment elevation myocardial infarction (STEMI)
Some patients underwent percutaneous coronary interventions (PCI). Some had atrial fibrillation and may have been receiving anticoagulants. Some patients had a history of CABG. It is presumed that patients were receiving some form of anticoagulation but this was not a study variable.
Outcome: all-cause in-hospital bleeding not related to CABG surgery or catheterization during hospitalization
Parameters:
(1) age in years, from 20 to 100 years
(2) Killip class
points for age =
= (1.25 * (age)) - 25
|
Killip Class
|
Points
|
|
I
|
0
|
|
II
|
0
|
|
III
|
31.7
|
|
IV
|
44
|
score =
= SUM(points for both parameters)
value of X =
= (0.03704 * (score)) - 6.244
probability of bleeding =
= 1 / (1 + EXP((-1) * X))
Alternatively:
value of Y =
= (0.0463523 * (age)) + (1.183282 if Killip III or 1.635615 if Killip IV) - 7.179377
probability of bleeding =
= 1 / (1 + EXP((-1) * Y))
