Do Type-O Italians Live Longer?

Some Italian paper says Type-O Italians live loger.
Reseachers examined the blood type of centenarians. Type O is accounted for 56.4%, which exceeds 43.5% of the national average.
Since the total number of subjects was as many as 5063, the result is statistically significant.
However, a previous survey of Tokyo (2004), type B was said to live longer.
This Italian result does not agree with the the Japanese.

Franchini M, Mengoli C, Bonfanti C, Rossi C, Lippi G.
Genetic determinants of extreme longevity: the role of ABO blood group.
Thromb Haemost. 2016 Jan;115(2):458-60. doi: 10.1160/TH15-05-0379. Epub 2015 Sep 3.
A statistically significant difference in the distribution of ABO blood groups between the cohorts of centenarians and donors was found (Pearson Chi-square test [3 d. o.f] = 10.71, p = 0.007). The significance was mainly due to a higher prevalence of O blood type in centenarians compared with controls (56.4 % vs 43.5 %, Pearson Chisquare test [1 d. o.f] = 10.78, p = 0.0010)

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