Abstract
The populations of nations having widely different civilizations, or of contrasting groups or races within nations, afford great natural laboratories for studies of arteriosclerosis and of the net effects produced by differences in diet, living habits, climate, stress, and other variables. This unique opportunity to study the disease in the human has brought forth from many parts of the world one of the largest accumulations of data in medical history. From it has come a new awareness of the scope and gravity of the problem. Vital statistics and the statistical approach in general have attained a new eminence in medicine