(Hypothetical). In a clinical trial, data collection usually starts at "baseline," when the subjects are recruited into the trial but before they are randomized to treatment or control. Data collection continues until the end of followup. Two clinical trials on prevention of heart attacks report baseline data on weight, shown below. In one of these trials, the randomization did not work. Which one, and why? p-968

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Number of persons Average weight SD (i) [Treatment 1,012 185 lb 25 lb Control 997 143 lb 26 lb Treatment 995 166 lb 27 lb (ii) Control 1,017 163 lb 25 lb