This also means that very little or no useful information is obtained by including the values of all the individuals in the county. There is only one disease rate for each county; thus it is only necessary to have one number for any of the variables being compared with the disease rate. 4. Piazza A. Food consumption and nutritional status in the People~ Republic of China. london: Westview Press, 1986. 5. Messina M, and Messina V The Dietitian~ Guide to Vegetarian Diets. Issues and Applications. Gaithersburg, MD: Aspen Publishers, Inc., 1996. Appendix C 1. Holick ME In: M. E. Shils,J . A. Olson, M. Shike and e. al (eds.), Modern nutrition in health and disease, 9th ed., pp. 329-345. Baltimore, MD: Williams and Wilkins, 1999. 2. Barger-lux MJ, Heaney R, Dowell 5, et al. "Vitamin D and its major metabolites: serum levels after graded oral dosing in healthy men." Osteoporosis Int. 8 (1998): 222-230.
