A Large-Scale Randomized, Double-Blinded Clinical Trial Was Conducted to Evaluate

A large-scale randomized, double-blinded clinical trial was conducted to evaluate the effect of beta-blocker therapy on the survival of patients with chronic heart failure, class IV.  The patients with severe heart failure were randomly assigned to receive either carvedilol (a beta blocker) or a placebo.  In their report of the results of the study, the investigators included a table with baseline characteristics (eg, age, race, prevalence of hypertension) of the patients in the treatment and placebo groups.  According to that table, both groups had a similar distribution of these characteristics.  With the information given, which of the following is most probable?

A) The sample size is adequate
B) The study is negative
C) The power of the study is big
D) Randomization is successful
E) Observer bias might be an issue

Correct Answer:

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