Key points are not available for this paper at this time.
Epidemiologic Methods in Current Cardiovascular Disease Research Ralph S. Paffenbarger, Jr. , and Dean E. Krueger CopyRight https: //doi. org/10. 2105/AJPH. 50. Suppl₁0. 105 Published Online: October 03, 2011
Paffenbarger et al. (1960) studied this question.