According to a 1991 report, several UK physicians suggested that the likelihood of cardiac problems were greater for shorter men. In a study of 2,500 men, the physicians found that those who were 5 feet tall were twice as likely to suffer heart complications as those who were over 6 feet tall. Their explanations for the disparity ranged from differences in nutrition to differences in the size of blood vessels between shorter and taller individuals. The same year, a Danish physician studied 20,000 men and women and declared the UK findings inapplicable to the study of heart complications.