Lee K S, Gartner L M, Paneth N, Tyler L
Can Med Assoc J. 1982 Feb 15;126(4):373-6.
In Canada between 1958 and 1977 the neonatal mortality dropped by more than 50%. the decline was most prominent from 1963 and was almost entirely due to an improvement in neonatal birthweight-specific mortality, which suggests an improvement in perinatal medical care. The timing and pattern of the decline are similar to those reported for the United States. There was a transient increase in the incidence of low and very low birthweight in both countries in the late 1960s. The cause of this increase remains unexplained.
1958年至1977年间，加拿大新生儿死亡率下降了50%以上。这种下降在1963年之后最为显著，几乎完全归因于特定出生体重新生儿死亡率的改善，这表明围产期医疗保健有所改善。下降的时间和模式与美国报告的情况相似。20世纪60年代末，两国低出生体重和极低出生体重的发生率都出现了短暂上升。这种上升的原因尚不明了。
