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Changes in the twinning rate in Canada 1926-70.

James (1972) has reported rapid falls of 20-25% in dizygotic twinning rates in nine European countries, Australia, and New Zealand, starting abruptly between 1956 and 1964. He does not assess the effect of age and parity changes but quotes a survey in Aberdeen (MacGillivray, 1970) which shows that there the fall affected both primigravidae and multigravidae at all ages. James suggests that food additives might be involved.