A nurse researcher is investigating the effect of type of operating room mattress and surgical position on tissue interface pressures in healthy young adults. Which component of research is most affected by the choice of subjects?
a. Mortality
b. Instrumentation
c. Internal validity
d. External validity
ANS: D
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A Attrition of subjects (mortality) would not be affected by the choice of subjects.
B Instrumentation to measure interface pressures would not be affected by the choice of subjects.
C Internal validity would not be affected by the choice of subjects.
D Subject selection affects external validity (generalizability), especially because most surgical patients are not healthy young adults.
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