Sibling rank and sibling number in relation to cardiovascular disease and mortality risk: a nationwide cohort study.
Peter M NilsssonJan SundquistKristina SundquistXinjun LiPublished in: BMJ open (2021)
Being first born is associated with a favourable effect on non-fatal cardiovascular and coronary events for both men and women. The underlying biological mechanisms for this should be studied in a sociocultural context.