Study population
In the Perined registry, 1,602,867 singletons were registered with gestational age between 35+0 and 42+6 weeks in the period between January 1st 2010 and December 31st 2019 (Supplementary Figure 1 ). We excluded 17,504 infants with severe congenital anomalies, and 2,175 deliveries with fetal mortality, leaving 1,583,188 liveborn eligible singletons for this study. Fetal mortality after a pregnancy of ≥35 weeks decreased significantly by 23.5% over the years (from 0.17% (n=279) in 2010 to 0.13% (n=193) in 2019 (p <0.0001) - Supplementary Table 1 ).