Season of birth and relative body weight

Abstract
The records for 9,103 nutrition clinic patients were analyzed for evidence of an association between month of birth and relative body weight status. The birth dates for overweight patients were unevenly distributed, with peak frequencies noted in March and September and lowest frequencies in October and November. The pattern of birth dates for older, overweight patients differed significantly from that for younger, overweight subjects. The monthly pattern for normal and underweight subjects showed a relative deficit during June and July, and differed significantly from the pattern for the overweight group.

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