1. Development of a Crohn's disease activity index (National Cooperative Crohn's Disease Study);Best, W.R.; Becktel, J.M.; Singleton, J.W.; F, Jr, Kern;Gastroenterology,1976
2. Indices of obesity derived from body weight and height;Khosla, T.; CT, Lowe;Br J Prev Soc Med; The use and interpretation of ponderal index and other weight-height ratios in epidemiologic studies,1967
3. Bent DH, eds. Statistical package for the social sciences;Nie, N.H.; Hull, C.H.; Jenkins, J.G.; Steinbrenner, K.,1975