[Mortality and care level of very low birth weight newborn infants. A population study].

A population study on 314 very low birth weight infants (VLBW) was carried out in 1987 in the Lazio Region of Italy to investigate the relation between the availability at birth of neonatal intensive care and infant mortality. Fifty-two percent of VLBW infants did not survive the first year of life. The mortality Odds Ratios, adjusted for four potential confounding variables, did not show a beneficial effect of Maternity units with neonatal intensive care (level 3) compared with those with special (level 2) and normal care (level 1). The overall high crude mortality rate together with the homogeneity of odds ratios among the different levels of care suggest that, when a regionalized perinatal care system is missing, as in Lazio region, the availability of neonatal intensive care, per se, does not improve the survival on this group of infants.