Preterm children born below 33–35 weeks of gestation have an increased risk of mathematical difficulties

Aim To investigate the association between gestational age (GA) and grade point averages by domains of language and mathematics at the end of lower secondary education. Methods A nationwide register‐based study including all Danish children born in 1992–1997 who completed lower secondary education. Grades were evaluated by GA. Domain‐specific differences in grades were investigated, and academic profiles were made. Results The study population comprised 319 796 children. For language, only minor differences in grades were observed. The grades in mathematics ranged from 7.02 (95% confidence interval [CI]: 7.00–7.04) at GA = 40 weeks to 5.86 (95% CI: 5.61–6.11) at GA