Pre-pregnancy Blood Pressure and Offspring Sex in the HUNT Study, Norway

To the Editor: We read with great interest the recent paper by Retnakaran et al.¹ describing an association between higher maternal pre-pregnancy systolic blood pressure and increased probability of delivering a boy. As the authors suggested this finding needs replication, which we aimed to do using the Norwegian HUNT Study.

http://ift.tt/2wPQipy