title: Factors affecting survival in infants weighing 750 g or less.
abstract: OBJECTIVE
  To assess which factors independently affect survival in infants weighing 750g or less.
  
  
  METHODS
  We reviewed the obstetric, neonatal, and placental pathology information of all non-malformed neonates with birth weight of 750g or less from January 1998 to December 2002. Logistic regression analysis was used to control for the effect of confounding variables. A P<0.05 was considered significant.
  
  
  RESULTS
  Fifty nine neonates fulfilled the inclusion criteria; 30 (51%) survived the perinatal period. Surviving neonates were more frequently born after steroid administration (P=0.03) and from indicated delivery (P=0.01), had greater birth weight (P=0.001), gestational age at delivery (P<0.001), and 5-min Apgar scores of 7 or more (P=0.04) than those who died. There were no significant differences in placental pathology between survivors and neonates who died. Stepwise logistic regression analysis showed that gestational age (P=0.01), birth weight (P=0.004), female sex (P=0.03), 5-min Apgar score (0.026), and steroid administration (P=0.04) were independent predictors of survival. Cumulatively these five predictors explained 69% of neonatal survival.
  
  
  CONCLUSIONS
  The predictors of survival among micropremies are the same as those reported for older preterm neonates. The type of preterm delivery (spontaneous versus indicated) and placental pathology do not independently affect survival.
authors.affiliation: Department of Obstetrics and Gynecology, Clinica Ostetrica Ginecologica, San Gerardo Hospital, University of Milano-Bicocca, Via Solferino 16, 20052 Monza, Italy. anna.locatelli@unimib.it
authors.forename: Anna
authors.initials: A
authors.lastname: Locatelli
authors.forename: Nadia
authors.initials: N
authors.lastname: Roncaglia
authors.forename: Camilla
authors.initials: C
authors.lastname: Andreotti
authors.forename: Valentina
authors.initials: V
authors.lastname: Doria
authors.forename: Daniela
authors.initials: D
authors.lastname: Doni
authors.forename: John C
authors.initials: JC
authors.lastname: Pezzullo
authors.forename: Alessandro
authors.initials: A
authors.lastname: Ghidini
mesh_terms: D000328:Adult; D001034:Apgar Score; D036861:Delivery, Obstetric / Q000379:methods; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000401:mortality* / Q000628:therapy; D007234:Infant, Premature; D019102:Infant, Very Low Birth Weight; D008297:Male; D011247:Pregnancy; D012044:Regression Analysis; D012737:Sex Factors; D013256:Steroids / Q000627:therapeutic use; D015996:Survival Rate
chemical_list: D013256:Steroids