You read an editorial in a peer-reviewed journal that promotes the use of strength training to improve fall risk in elderly adults. You follow up with an article in another peer-reviewed scientific journal describing a randomized controlled trial that evaluated elderly adults who did not strength train versus those that performed a 4-week trial of strength training and found only a small (but statistically insignificant) difference in their fall risk. Finally, you consult a third peer-reviewed journal and read a systematic review of the topic which found that indeed elderly adults had a lower fall risk if they performed strength training exercises on a regular basis. Which of these sources of information provides the strongest level of evidence?
A. The editorial, it was written by one of the editors and so carries the greatest weight.
B. The randomized controlled trial.
C. The systematic review.
D. Each of the articles is equally valuable as evidence.
Answer: C
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