Investigation towards research society have been get across-tabulated from the kid gender, GA, together with two-time episodes (1973–1978 and 1995–2010)
As a first step, rates of adverse outcomes per 1000 live births were calculated according to infant sex, GA, and the studied period. Thereafter, for each time period, using the gestational age categories as the exposure variable (early term and late preterm infants, respectively, with midterm infants as the reference category), we used logistic regression to estimate odds for prematurity-related adverse outcomes such as neonatal death, low Apgar sitios de citas de personas negras score (<7 at 5 min), pneumothorax, RDS, other respiratory conditions, and hyperbilirubinemia.