Previous studies suggest that vegetarians may not receive enough zinc in their diets and the zinc requirement is especially important during pregnancy. Twenty-three women were monitored: twelve vegetarians who were pregnant, six nonvegetarians who were pregnant, and five vegetarians who were not pregnant. Is there any evidence that pregnant vegetarians tend to have lower zinc levels than pregnant nonvegetarians?
A data frame with 23 observations on the following 2 variables.
levels of Zinc (mug/g) in the hair of women
a factor with levels
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
King, J.C., Stein, T. and Doyle, M. (1981). Effect of Vegetarianism on the Zinc Status of Pregnant Women, American Journal of Clinical Nutrition 34(6): 1049–1055.