Journal of Aging Research / 2011 / Article / Tab 4

Research Article

Season of Birth and Exceptional Longevity: Comparative Study of American Centenarians, Their Siblings, and Spouses

Table 4

Month-of-birth distributions (in percent) for the US 1900 Census population, centenarians, and their siblingsa.

Month of birth1900 Census, 5% sample Persons born in 1880–95CentenariansSiblings survived to age 20
,320,328 ,570Standardized residuals ,175Standardized residuals

January9.11   8.60−0.6718.88−0.721
February8.43   8.79   0.4918.69   0.847
March9.51   7.77−2.2359.73   0.693
April8.50   8.03−0.6458.33−0.568
May9.08   7.07−2.6437.44−5.200
June7.17   6.62−0.8086.87−1.086
July7.78   6.37−2.0047.57−0.704
August8.51   8.54   0.0348.27−0.780
September8.3810.32   2.6538.80   1.375
October8.2410.25   2.7818.74   1.672
November7.36   9.24   2.7397.80   1.567
December7.92   8.41   0.6878.87   3.240

aMonth-of-birth distributions for both centenarians and their siblings differ from the month-of-birth distribution for the general population (individuals enumerated in the 1900 census and born in 1880–1895); difference significant at .

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.