Statistical Investigation of Birth and Death of the Infant

Report 1. The Relations between Birth and Social Condition

Abstract

Statistical investigations were made on the birth weight of 14, 801 babies which were born in Namie Area in Fukushima prefecture during the period 1952 to 1957.
The birth weight were analysed in accordance with such factors that the monthly vatiation, seasanal variation, influence of birth order and mothers age.
The occurrence rate of premature birth was 6.6 percent (male 5.8, femal 7.5) of the total number of live births. The mean value of birth weight of male was greater than that of femal.
It was suggested that the limit of premature infant in femal must be lower than the in case of male.
The occurence rate of birth in January was the highest and the lowest in December.
The frequency of premature infant was the highest in the first born and the lowest in mother's age 25 to 29