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An investigator examined the relationship between the incidence of Coronary Heart Disease (CHD) and behavior type,...

An investigator examined the relationship between the incidence of Coronary Heart Disease (CHD) and behavior type, systolic blood pressure, and smoking exposure. The table below presents a summary of the logistic regression model applied to evaluate the association between behavior type and CHD. Type-A individual is coded as 1, while type-B individual is coded as 0.

Variables

Estimates

Standard Errors

p-Values

OR

Constant

– 2.934

0.115

–

–

A/B

0.864

0.140

< 0.001
  1. Compute the probability of a CHD event among those individuals with type-A behavior.
  2. Compute the probability of a CHD event among those individuals with type-B behavior.
  3. Compute the estimated odds ratio.
  4. Interpret the odds ratio you computed above in the context of what the investigator was examining.
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