By the late 1980s, the Type-A concept underwent some major modifications. One was the recognition that personality factors are more predictive of heart disease when considering people who get their first heart attack at an early age—by later years, the occurrence of a first heart attack is more about fats and smoking. Moreover, work by Redford Williams of Duke University convinced most in the field that the key factor in the list of Type A-ish symptoms is the hostility. For example, when scientists reanalyzed some of the original Type-A studies and broke the constellation of traits into
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