Estimation of optimal birth weights and gestational ages for twin births in Japan

BMC Public Health
Noriko Kato, Tomohiro Matsuda

Abstract

As multiple pregnancies show a higher incidence of complications than singletons and carry a higher perinatal risk, the calculation of birth weight - and gestational age (GA)-specific perinatal mortality rates (PMR) for multiple births is necessary in order to estimate the lowest PMR for these groups. Details of all reported twins (192,987 live births, 5,539 stillbirths and 1,830 early neonatal deaths) in Japan between 1990 and 1999 were analyzed and compared with singletons (10,021,275 live births, 63,972 fetal deaths and 16,862 early neonatal deaths) in the annual report of vital statistics of Japan. The fetal death rate (FDR) and PMR were calculated for each category of birth weight at 500-gram intervals and GA at four-week intervals. The FDR according to birth weight and GA category was calculated as fetal deaths/(fetal deaths + live births) x 1000. The perinatal mortality rate (PMR) according to birth weight and GA category, was calculated as (fetal deaths + early neonatal deaths)/(fetal deaths + live births) x 1000. Within each category, the lowest FDR and PMR were assigned with a relative risk (RR) of 1.0 as a reference and all other rates within each category were compared to this lowest rate. The overall PMR per 1,000 ...Continue Reading

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Citations

Sep 11, 2009·The Journal of Trauma·Dan L DeckelbaumMark G McKenney
Jun 2, 2012·TheScientificWorldJournal·Adriana Regina de AndradeGladson Ricardo Flor Bertolini
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Aug 29, 2021·American Journal of Obstetrics & Gynecology MFM·Amir AviramElad Mei-Dan

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