Figure 1
From: School grades and educational attainments of adolescents and young adults born preterm
Study population. Note that information on the emigrations and deaths of the individuals were accessible only before 30th April 2012. Birth weight SD-score (BWSDS) was considered inaccurate if it was ≤ − 6.0, or, among preterm index children, > 3.0 according to national sex specific birth weight standards44 available for the gestational weeks of 23–43.
