A cross-sectional study to investigate the relationship between personal characteristics and dietary factors, and plasma concentrations.
data("plasma")A data frame with 315 observations on the following 14 variables.
ageage (years)
sexsex, 1=male, 2=female
smokstatsmoking status 1=never, 2=former, 3=current Smoker
bmibody mass index weight/(height^2)
vitusevitamin use 1=yes, fairly often, 2=yes, not often, 3=no
caloriesnumber of calories consumed per day
fatgrams of fat consumed per day
fibergrams of fiber consumed per day
alcoholnumber of alcoholic drinks consumed per week
cholesterolcholesterol consumed (mg per day)
betadietdietary beta-carotene consumed (mcg per day)
retdietdietary retinol consumed (mcg per day)
betaplasmaplasma beta-carotene (ng/ml)
retplasmaplasma retinol (ng/ml)
``Observational studies have suggested that low dietary intake or low plasma concentrations of retinol, beta-carotene, or other carotenoids might be associated with increased risk of developing certain types of cancer \ ... We designed a cross-sectional study to investigate the relationship between personal characteristics and dietary factors, and plasma concentrations of retinol, beta-carotene and other carotenoids." Harrell (2002)
Harrell, F. E. (2002), Plasma Retinol and Beta-Carotene Dataset, https://hbiostat.org/data/repo/plasma.html