Health statistics from U.S. national health survey, series B. 10. Disability days United States July 1957-June 1958, statistics on volume of restricted-activity days, work-loss days, and school-loss days by age, sex, residence, family income, major activity, and calendar quarter. Based on data collected in houshold interviews during period July 1957-June 1958; [prepared by Jane W. Bergsten].

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