[Perinatal mortality in Brazil in 2018: an epidemiological analysis according to the modified Wigglesworth classification].

Perinatal mortality includes fetal mortality and early neonatal mortality (0 to 6 days of life). The study described perinatal deaths in Brazil in 2018 according to the modified Wigglesworth classification. The data sources were the Brazilian Mortality Information System and the Brazilian Information System on Live Births. Fetal mortality and perinatal mortality rates were calculated per 1,000 total births (live births plus stillbirths) and the early neonatal mortality rate per 1,000 live births, compared using their respective 95% confidence intervals (95%CI). Perinatal deaths were classified in groups of antepartum causes, congenital anomalies, prematurity, asphyxia, and specific causes. For each group of causes, the study calculated the number of deaths by weight group, in addition to mortality rates and respective 95%CI, besides the spatial distribution of mortality rates by state of Brazil. A total of 35,857 infant deaths were recorded, of which 18,866 (52.6%) were early neonatal deaths, while stillbirths totaled 27,009. Perinatal deaths totaled 45,875, for a mortality rate of 15.5‰ births. The highest mortality rate (7.6‰; 7.5‰-7.7‰) was observed in the antepartum group, followed by prematurity (3.6‰; 3.6‰-3.7‰). In the antepartum group, 14 of the 27 states (eight of which in the Northeast and four in the North) presented perinatal mortality rates above the national rate. Perinatal mortality in Brazil was high, and most deaths could have been prevented with investment in prenatal and childbirth care.