抄録
Thirty four hundreds ninety nine cases of birth at the Second Tokyo National Hospital during the period between November 1950 and June 1956 were classified into mature, premature and stillbirth groups. Their birth rate, rate of mortality, causes of death and history and present states of mothers were discussed.
1) Birth rate of the prematures was 11.9%, and the figure is higer than the average reported by the Ministry of Health & Welfare. On the other hand, the mortality rate was 1.3%, and it is lower than the average of Ministry of Health & Welfare.
2) Seventy eight point six per cent of the prematures had their weights of 2kg or more.
3) Forty per cent of the prematures under 1.999kg of body weights died within one week after their birth.
4) Sixty one point three per cent of the prematures were born at the 10th or 11th month.
5) There were 30 cases of twins and their mortality rate was equal to the normal.
6) Higher rate of premature delivery was observed in the advancing maternal age and advancing birth number.
7) The lowest premature mortality rate was seen in the group in which maternal ages were between 20 and 29. The rate increased when maternal ages were older or younger than the above age group.
