周産期死亡率の年次推移の観察

概要

論文の詳細を見る
Perinatal mortality rates in Japan, show a decrease of 7.95 per 1000 births, from 1969 through 1976. The present study was undertaken to offer possible explanations for the decline of the perinatal mortality during this period. Observations were made, based on the annual changes during this period, in the proportion of deliveries and the perinatal mortality rates related to birth weight, gestational period, maternal age, birth order, single or multiple birth, sex, place of delivery, and delivery attendant. The following results were obtained from these observations: 1. A decrease in the proportion of low, birth-weight deliveries accounted for nearly one-third of the reduction in the perinatal mortality. 2. A decrease in the proportion of low, birth-weight deliveries, and of the proportion of deliveries with short gestational periods, accounted for about one-half of the decline in the mortality rate. 3. About 40 per cent of the reduction in the proportion of low-birth-weight deliveries was attributable to a decrease in the proportion of deliveries with short gestational periods.