Abstract
To the Editor: In his article in the issue of June 14, Dr. Moore compares 1978 hospitalization rates of United Healthcare with rates of two other health-care plans also based in Seattle. He notes the large differences of rates among the plans and that United Healthcare had fewer bed-days per thousand enrollees per year than did the two competitors. He states that these preliminary data suggest that lower hospitalization rates at United Healthcare result in savings not explained by markedly different age or sex profiles and indicates that these lower rates are surprising.I believe that other explanations for the . . .

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