Seasonal variation in anencephalus in Canada.
A study of the monthly numbers of stillbirths and of deaths due to anencephalus in Canada from 1954 to 1962 showed a weak tendency to a winter excess of affected births. The seasonal trend was more marked in the Prarie provinces and in Quebec than elsewhere; the maximum rate of anencephalus occurrence was in October to December in the Prairies and in British Columbia, and in January to March in other regions.
D000757:Anencephaly / Q000453:epidemiology*; D001955:British Columbia; D002170:Canada; D005260:Female; D005313:Fetal Death / Q000209:etiology; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D009864:Ontario; D011247:Pregnancy; D011792:Quebec; D012621:Seasons; D012737:Sex Factors