Here is a shortened version of the summary of a paper in the New England Journal
ID: 3365126 • Letter: H
Question
Here is a shortened version of the summary of a paper in the New England Journal of Medicine that compares the fate of heart attack victims in three types of hospitals. ("Acute myocardial infarction" is medical jargon for a heart attack.) The next four questions concern this summary.
Background. "America's Best Hospitals," published annually by U.S. News & World Report, assesses the quality of hospitals. It is not known whether patients admitted to hospitals ranked at the top in cardiology have lower short-term mortality from acute myocardial infarction than those admitted to other hospitals.
Methods. Using data from the Cooperative Cardiovascular Project on 149,177 elderly Medicare beneficiaries with acute myocardial infarction in 1994 or 1995, we examined the care and outcomes of patients admitted to three types of hospitals: those ranked high in cardiology (top-ranked hospitals); hospitals not in the top rank that had onsite facilities for cardiac catheterization, coronary angioplasty, and bypass surgery (similarly equipped hospitals); and the remaining hospitals (non-similarly equipped hospitals). We compared 30-day mortality.
Results. Admission to a top-ranked hospital was associated with lower adjusted 30-day mortality (odds ratio, 0.87; 95% confidence interval, 0.76 to 1.00).
Reference: Ref 5-5
The explanatory and response variables are:
explanatory = type of hospital; response = 30-day mortality.
explanatory = elderly Medicare beneficiaries; response = 30-day mortality.
explanatory = type of hospital; response = heart attack or not.
explanatory = 30-day mortality; response = type of hospital.
A.explanatory = type of hospital; response = 30-day mortality.
B.explanatory = elderly Medicare beneficiaries; response = 30-day mortality.
C.explanatory = type of hospital; response = heart attack or not.
D.explanatory = 30-day mortality; response = type of hospital.
Explanation / Answer
The examined variable was different type of hospitals and the comparison was done on 30 - day mortality.
Hence,
explanatory = type of hospital; response = 30-day mortality
Option A is correct.
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