2 Data & Methods
|My analysis of the relationship between month of birth
and life expectancy is based on two different sets of data. For Austria the exact dates of
birth and death are known for all 302,412 men and 379,265 women who died between 1988 and
1996 at ages 50 and above. Causes of death are given for 460,649 persons for the years
1990 to 1997.
The Danish data consist of a mortality follow-up of all Danes who were at least 50 years old on 1 April 1968; 1,371,003 people were followed until their death or until the end of the observation period (week 32 of 1998). All these people were either born in Denmark (1,304,959 individuals) or their place of birth is unknown (66,044 individuals). The study excludes 1,994 people who were lost to the registry during the observation period. Among those who are included in the study, 85.5% (1,176,494 individuals) died before week 32 of 1998; 14% (192,515 individuals) were still alive.
To test whether the seasonal distribution of births changes with age in Austria I collected data on the number of births per month for the years 1880 to 1907. Only the German-speaking regions of the Austro-Hungarian Empire are included. The data are taken from the annual publications of the Central Bureau of Statistics (Statistisches Jahrbuch 1880 -1907).
|Longevity and Month of Birth:
Evidence from Austria and Denmark
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