Estándar de peso para la edad gestacional en 55706 recién nacidos sanos de una maternidad pública de Buenos Aires. / [Standard of birth weight for gestational age in 55706 healthy newborns in a public maternity of Buenos Aires]

ABSTRACT

Birth-weight-for-gestational-age patterns in Argentina are scarce and outdated. The same study has been performed within our institution for 8 years already. Our hypothesis is that there could have been population changes with repercussions on fetal growth. The objectives were 1) to determine new normal values of birth weight (BW)-for-gestational-age; 2) to study growth speed and acceleration, and 3) to compare these new results between trienniums. Population All liveborn babies between 1988-1998 (n = 67,857) were included. Those with BW lower than 500 g, gestational age (GA) lower than 25 weeks or mistakes in the appraisal of GA and outliers (birth-weight-for gestational-age > 2.5 DS of the median) were excluded. Those without maternal or obstetric history that could have influenced the BW were defined as [quot ]healthy newborns[quot ] (n = 55,706). The software Persi, that employs 34 of the 93 variables included in the Perinatal Clinical Record (SIP/OPS/OMS, Agustina v 5.1), was used. Birth weight median, standard deviation and error, coefficient of variation, skewness and kurtosiss coefficients, real and polynomial percentiles, standard distribution (Z), and the corresponding charts were generated in an automatic way for each gestational week and through the use of the method of least squares (polynomial models up to 4th grade). Results were as follows maximum variability 15