The epidemiology of the QRS axis measurement.
D000375:Aging; D001794:Blood Pressure; D001835:Body Weight; D002784:Cholesterol / Q000097:blood; D003327:Coronary Disease / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D012907:Smoking; D013223:Statistics as Topic
D002784:Cholesterol