Format
A data frame with 315 observations on the following 17 variables.
ID ID number for each subject in this sample Age Subject's age (in years)
Smoke a factor
with levels No Yes
Quetelet Weight/(Height^2) Vitamin Vitamin use: 1=Regular,
2=Occasional, or 3=No
Calories Number of
calories consumed per day
Fat Grams of fat consumed per day Fiber Grams of fiber consumed per day Alcohol Number of alcoholic drinks consumed per week Cholesterol Cholesterol consumed (mg per day) BetaDiet Dietary beta-carotene consumed (mcg per day) RetinolDiet Dietary retinol consumed (mcg per day) BetaPlasma Plasma beta-carotene (ng/ml) RetinolPlasma Plasma retinol (ng/ml) Sex Cosed as Female or Male VitaminUse Coded as No Occasional
Regular
EverSmoke Smoking status: Never,
Former, or Current
PriorSmoke Smoking status: 1,
2, or 3
Source
Nierenberg, Stukel, Baron, Dain, and Greenberg, "Determinants of
plasma levels of beta-carotene and retinol", American Journal of
Epidemiology (1989).