The death rates of surgical patients differ for operations in which different anesthetics are used. An observational study found these death rates for four anesthetics:
Anesthetic: Halothane Pentothal Cyclopropane Ether
Death rate: 1.7% 1.7% 3.4% 1.9%
This is not good evidence that cyclopropane is more dangerous than the other anesthetics.
A.
Financial background of the patient
B.
Types of surgical instruments
C.
Physical condition of the patient
Answer: C.
Physical condition of the patient
Anesthetic: Halothane Pentothal Cyclopropane Ether
Death rate: 1.7% 1.7% 3.4% 1.9%
This is not good evidence that cyclopropane is more dangerous than the other anesthetics.
Identify a lurking variable that may be confounded with the choice of anesthetic in surgery and that could explain the different death rates.
A.
Financial background of the patient
B.
Types of surgical instruments
C.
Physical condition of the patient
Answer: C.
Physical condition of the patient
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