Canadian Birth Seasonality and its Possible Association with Seasonal Brightness

Canadian Birth Seasonality and its Possible Association with Seasonal Brightness

Canadian Birth Seasonality and its Possible Association with Seasonal Brightness

Canadian Birth Seasonality and its Possible Association with Seasonal Brightnesss

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Référence bibliographique [11760]

Cummings, David R. 2012. «Canadian Birth Seasonality and its Possible Association with Seasonal Brightness ». Canadian Studies in Population, vol. 39, no 1-2, p. 45-62.

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Fiche synthèse

1. Objectifs


Intentions :
«Cet article analyse le lien éventuel entre la luminosité atmosphérique et le caractère saisonnier des naissances au Canada [...]. Une corrélation est fait [sic] entre les naissances et la luminosité [dix à onze mois plus tôt] dans plusieurs villes de neuf provinces au pays.» (p. 45)

Questions/Hypothèses :
«While the present paper postulates that seasonal changes in cloudiness offers a plausible explanation for much of seasonality, the possible effect from other influences must also be acknowledged.» (p. 47)

2. Méthode


Échantillon/Matériau :
L’auteur utilise des données de luminosité atmosphérique qui proviennent des aéroports, d’Environnement Canada et des gouvernements provinciaux. Les données sur les naissances en fonction des saisons sont tirées des recherches de F. Trovato et D. Odynak.

Type de traitement des données :
Analyse statistique

3. Résumé


«The present study confirms what two previous studies have shown, birth seasonality is a valid phenomenon for human populations in Canada. The present study, however, suggests that much of seasonality may be associated with atmospheric brightness, several months prior to the conceptual month.» (p. 53) «Because these results confirm a direct, positive association between seasonal brightness and birth seasonality, the seasonal brightness hypothesis proved correct and cannot be dismissed in Canada. Variation in seasonal brightness may be a major influence on seasonality while other factors are secondary. Seasonal changes in atmospheric brightness offers a simple, reasonable explanation for how seasonality patterns vary over time. Because the hypothesis may be easily disproved, prudent researchers are encouraged to do so. Future research is recommended to determine the precise physiological means by which seasonal brightness might affect birth seasonality.» (p. 58) À noter que plusieurs statistiques sont présentées pour les villes de Montréal et de Québec.