That association didn't change for patients who were previously diagnosed with depression before their heart disease diagnosis or for patients
whose angiograms were performed for various reasons, which included stable angina, unstable angina, or heart attack.
You analyze the definitive studies and find that the number of people
whose lives are saved by bypass surgery,
angiograms, and cholesterol - lowering drugs is statistically insignificant — and yet life expectancy has risen since the advent of all three of those treatments.