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Early Neonatal, Neonatal, and Infantile Mortality Risk by Birth Weight and Gestational Age
Author(s) -
Sato Akira,
Suzuki Masakuni,
Endo Chikara,
Sato Masumi,
Yamaguchi Yu,
Yokaichiya Takashi,
Kawazoe Yoshiyuki
Publication year - 1985
Publication title -
asia‐oceania journal of obstetrics and gynaecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 50
eISSN - 1447-0756
pISSN - 0389-2328
DOI - 10.1111/jog.1985.11.4.469
Subject(s) - gestational age , birth weight , medicine , gestation , obstetrics , pediatrics , neonatal mortality , low birth weight , infant mortality , pregnancy , population , biology , genetics , environmental health
We analysed 61,662 live‐born infants in Miyagi prefecture, Japan, during the period of July 1979 to June 1981 in order to draw the contour lines of early neonatal, neonatal, and infantile mortality rates. The total live‐births were classified by birth weight and gestational age, dividing birth weight into 200 gm groups for each week of gestation. The number of live‐births was largest in the block of 40 weeks and 3,200–3,399 gm (3,793 cases; 6.2%). First, we investigated the number of early neonatal deaths classified according to birth weight and gestational age. Early neonatal mortality risk was estimated in each block classified by birth weight and gestational age and contour lines of early neonatal death rates were drawn using the ACOS 1000 computer system of the Tohoku University. By this analysis the lowest mortality rate is expected for the infants born at 39.93 weeks of gestation with 3,567 gm of birth weight. The same method has also been applied to the neonatal and infantile mortality risks, and similar contour lines have been determined for these cases. Using these charts, we can estimate the prognosis of an infant at its birth.