An explanation for the observed increase in mortality after a birthday in people over 75 years old.
In a recent analysis, Alderson (1975) presented data that suggested a statistically significant, although numerically small, relationship between the month of birth and the month of death of elderly people. It is shown here that this relationship was to be expected from the sampling procedure used and was not related to "birthday stress" factors.
D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D009026:Mortality; D012621:Seasons; D013997:Time Factors