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The authors have attempted to determine what numbers of male British workers are physically able to continue in their various occupations beyond their mid-60's. They select 32 representative occupations fulfilling certain criteria and apply to them data derived from the census reports for 1921, 1931, and 1951. By the method of "moving cohorts," the authors endeavor to trace the fate of a category of workers through the three census periods. By comparing the census figures for each period as they apply to the selected categories or "cohorts," they believe they can show how many of these (1) have remained in the same occupation, (2) have retired and are unemployed, (3) have migrated overseas, (4) have died, and (5) have transferred to some other occupation. On the basis of these data, the survival rates of each of the occupations are given. It is interesting to find that more makers of watches,
Ageing in Industry: An Inquiry, Based on Figures Derived from Census Reports, into the Problem of Ageing under the Conditions of Modern Industry. JAMA. 1957;163(14):1306–1307. doi:10.1001/jama.1957.02970490104026
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