To ascertain whether the increase in the crude infant mortality rate in Canada in 1993 was due to a recent increase in the registration of newborns weighing less than 500 g as live births.
Ecological study, with Poisson regression analysis.
Canada.
All live births and infant deaths in Canada between 1987 and 1993, as reported by Statistics Canada. Data from Newfoundland were excluded because they were incomplete for 4 years.
Proportion of live births by low-birth-weight category; and annual crude and adjusted infant mortality rates.
Over the study period the proportion of newborns weighing less than 500 g registered as live births increased significantly (chi 2 for trend = 71.26, p
Notes
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