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  1. John S Yudkin
  1. Professor of medicine Academic Division of Medicine, Whittington Hospital, London N19 3UA

    EDITOR,--Steven A Grover and colleagues compared estimates by doctors of gains in life expectancy as a result of a reduction in risk factors with those estimated from their computer model of prevention of coronary heart disease.1 The model they used is based on logistic regression analyses, using data from the Framingham heart study, the Canada health survey, and Canadian life tables.2 They calculated potential gains in life expectancy with intervention by applying to …

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