[Correlation between some environmental, anamnestic and social markers of pregnant patients and the delivery of eutrophic premature and hypotrophic newborn infants].

12,577 single newborns of 19 hospitals of the northern districts of GDR were classified immediately after birth following the recommendations of WHO from 1971 and the Society of Perinatal Medicine of GDR for classification of newborns. In a prospective study the influence of some different parameters on the relative frequency of deliveries of preterm appropriate-for-gestational-age infants and term small-for-gestational-age infants was proved. To secure the statistical statements u-test was used. A sometimes different efficiency of the proved parameters on the tested groups demonstrated that preterm appropriate-for-gestational-age infants, term small-for-gestational-age infants and other groups of newborns of low birth-weight should'nt be collected as infants of low birth-weight up to 2,499 g in present time. With the provided introduction of new percentiles in GDR an exact classification of newborn infants should be realized all over the country.