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ence now of such differentials in societies with very different social structures to those of Britain today. When Chapin documented mortality differentials in Providence in 1924 he hoped that such a demonstration would be preparation for "what should be of great value, namely a study of the habits of life and environment which make for the longevity of the well-to-do."28 This still pertains.
Irvine Loudon (Sat,) studied this question.
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