Preterm birth characteristics and outcomes in Portugal, between 2010 and 2018-A cross-sectional sequential study.

A total of 38,930 births occurred between weeks 33 and 36 +6 , corresponding to 89.4% of the preterm births presenting an increasing trend from 76.9% in 2010 to 81.0% of all preterm births. 3.2 Sex Prematurity was consistently more frequent in the male sex in all years, corresponding to 52% of preterm birth (Table 2 ). 3.3 Gestational age Globally, preterm births varied yearly from 7.3% to 8.0% of all births.

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In the yearly death analysis, a decreasing trend was observed in deaths of 31–32 and 33–34 weekers and no particular trend was evident for other gestational ages or overall trend.

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