We compared the weight-reducing effect of diet and gastroplasty with that of diet alone in a randomized trial in 60 morbidly obese patients followed for two years. Initial median body weight was 120 kg in patients randomly assigned to gastroplasty plus diet and 115 kg in those assigned to diet alone. Maximum weight losses did not differ significantly between the groups (26.1 kg in the gastroplasty group and 22.0 kg in the group treated with diet alone, P greater than 0.05). The risk of a Type II error with a true difference larger than 9.5 kg was less than 5 per cent. However, the group treated with diet alone regained significantly more weight after maximum weight loss had been achieved, so that the gastroplasty group had a more favorable net outcome at two years (P less than 0.05).
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