A Trotter, L Maier, M Kron, et al. Effect of oestradiol and progesterone replacement on bronchopulmonary dysplasia in extremely preterm infants (Arch Dis Child Fetal Neonatal Ed 2007;92:F94–8). The legend in figure 2 of this paper was published incorrectly. The filled bars are actually the ESTRA-PRO group and the open bars are the placebo group. Also, “bonchopulmonary dysuplasia” is misspelt and should be “bronchopulmonary dysplasia”. Finally, “ITT survivors” should have been amended to “ITT population (survivors)”. We apologises for these oversights.