In the exemplar cohort study about smoking and bone healing after an orthopaedic surgery (W-Dahl & Toksvig-Larsen, 2004) , which combination of strategies did the researchers use to check on the influence of potential confounding variables?
A) Eliminated persons with severe deformity and ran a healing profile analysis on those in the study
B) Compared characteristics profiles of the two groups and ran a multiple regression analysis that included variables they thought might affect healing
C) Had strict exclusion criteria and randomly selected patients for the study
D) Identified persons who had smoked for 25 years or more and ran t-tests to compare their healing outcomes to those who smoked less than 25 years
Correct Answer:
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