Description Usage Format Source References Examples
Female mice were randomly assigned to six treatment groups to investigate whether restricting dietary intake increases life expectancy. Diet treatments were:
"NP"
—mice ate unlimited amount of nonpurified, standard
diet
"N/N85"
—mice fed normally before and after weaning.
After weaning, ration was controlled at 85 kcal/wk
"N/R50"
—normal diet before weaning and reduced calorie
diet (50 kcal/wk) after weaning
"R/R50"
—reduced calorie diet of 50 kcal/wk both before
and after weaning
"N/R50 lopro"
—normal diet before weaning, restricted
diet (50 kcal/wk) after weaning and dietary protein content
decreased with advancing age
"N/R40"
—normal diet before weaning and reduced diet (40
Kcal/wk) after weaning.
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A data frame with 349 observations on the following 2 variables.
Lifetime
the lifetime of the mice (in months)
Diet
factor variable with six levels—"NP"
,
"N/N85"
, "lopro"
, "N/R50"
, "R/R50"
and
"N/R40"
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
Weindruch, R., Walford, R.L., Fligiel, S. and Guthrie D. (1986). The Retardation of Aging in Mice by Dietary Restriction: Longevity, Cancer, Immunity and Lifetime Energy Intake, Journal of Nutrition 116(4):641–54.
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