Health statistics from U.S. National health survey series. B-31. Duration of limitation of activity due to chronic conditions, United States, July 1959-June 1960, statistics on number of persons with limitation of activity due to chronic conditions and duration of limitation of activity by sex, age, and usual activity status, based on data collected in household interviews during period July 1959-June 1960; [prepared by Charles S. Wilder].

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