title: Impact of changing age and parity distributions of mothers on perinatal mortality in Sweden, 1953-1975.
abstract: A study was made on how the shift in the age and parity distribution of mothers affected the perinatal mortality in Sweden between 1953-55 and 1973-75. During these years the overall perinatal mortality rate fell from 29 to 13 per 1 000 births. The authors used the specific perinatal mortality rates by the mother's age and infant's birth order in 1973-75 to calculate what the overall perinatal mortality rate would have been with the age and parity distributions of mothers in 1953-55 and 1963-65. They conclude that only 1.4 of the 16 per 1 000 decline in perinatal mortality could be attributed to the shift in the mother's age and parity distribution.
mesh_terms: D000328:Adult; D001722:Birth Order; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008423:Maternal Age; D008875:Middle Aged; D010298:Parity; D011247:Pregnancy; D012606:Scotland; D013548:Sweden; D013997:Time Factors; D014481:United States