A large decrease in the magnitude of seasonal fluctuations in mortality among elderly explains part of the increase in longevity in Sweden during 20th century.

BMC Public Health · 2020 · PMC7654045 · PMID 33167913

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highly significantp -values <0.001actually significant

The coefficients of the sinusoidal terms were highly significant in all cohorts (F-test, all p -values <0.001), indicating that the model with seasonality better accounted for the data than did a model with just an exponential increase with age.

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