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PERCENTILES OF BIRTH WEIGHTS OF SINGLE, LIVE BIRTHS AT DIFFERENT GESTATION PERIODS: Based or. 125 485 births in Norway, 1967 and 1968
Author(s) -
BJERKEDAL TOR,
BAKKETEI LEIV,
LEHMAN EGIL H.
Publication year - 1973
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.1973.tb08137.x
Subject(s) - gestation , birth weight , medicine , obstetrics , parity (physics) , percentile , pregnancy , gestation period , gynecology , biology , mathematics , statistics , genetics , physics , particle physics
Summary A total number of 125 485 single, live births with known sex and birth weight, and a gestation period estimated to be from 28.0 to 48.9 weeks, were registered in Norway in 196 and 1968. Information about these births pro vided by a national scheme of medical registration of births is used in a study of the relation between birth weight and gestation period. An almost linear relation was found to exist for gestation periods of 35 to 42 weeks. In this interval, median birth weight increased about 200 g a week. At the same gestation period male births were found to be on the average about 150 g heavier than female births. Parity also had a notable influence on birth weight. For gestation periods of 35 weeks and more, the birth weight of a first born male was found to average about 170 g less than that of a second and subsequently born. For female births the difference was 130 g. The material is suggested for use as reference for birth weight at various gestation periods and tables are included for this purpose.