“…First, we performed a pre‐analysis of non‐matched data. The variables used to calculate the propensity score were selected based on the literature and availability in the national registry 1,4,5,7,16,21 . The matching variables used for IOL included late start of antenatal care (≥15 weeks of gestation), parity, ethnicity, infertility treatment (ART), maternal age, socioeconomic status quintiles, year of birth (2010–2019), birthweight percentile in five groups (p5‐p9, p10‐p49, p50‐79, p80‐p89, p90‐p100), and male sex of the child.…”