One well-designed randomized clinical trial (RCT) reflects which of the following levels of research evidence?
a. Level I
b. Level II
c. Level III
d. Level IV
B
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A Level I research evidence includes systematic reviews, meta-analysis, and three or more RCTs.
B One or two well-designed RCTs reflect level II research evidence.
C Level III research evidence shows one or more well-designed controlled trials without randomization.
D Level IV research evidence shows one or more well-designed case control or cohort studies.
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