Customized weight curves for Spanish fetuses and newborns

AbstractObjectives: To construct a model of customized birthweight curves for use in a Spanish population.Materials and methods: Data of 20 331 newborns were used to construct a customized birthweight model. Multiple regression analysis was performed with newborn weight as the dependent variable and gestational age (GA), sex and maternal (M) weight, height, parity and ethnic origin as the independent variables. Using the new model, 27 507 newborns were classified as adequate for GA (AGA), large for GA (LGA) or small for GA (SGA). The results were compared with those of other customized and non-customized models.Results: The resulting formula for the calculation of optimal neonatal weight was:Optimum weight (g) = 3289.681 + 135.413*GA40–14.063*GA402–0.838*GA403 + 113.889 (if multiparous) + 165.560 (if origin = Asia) + 161.550 (South America) + 67.927 (rest of Europe) +109.265 (North Africa) + 9.392*Maternal-Height + 4.856*Maternal-Weight–0.098*Maternal-Weight2 + 0.001*Maternal-Weight3 + 67.188*Sex + GA40*(...