BMD {epicalc} | R Documentation |
This data contains information from a clinical trial investigating three doses of a drug which is thought to affect bone mineral density levels in postmenopausal women. Treatment 1 is the lowest dosage of the drug and Treatment 3 is the highest. Subjects were postmenopausal women who were randomly allocated to one to the three doses. Bone mineral densities were measured at the start of the trial and at 12 and 24 mnths after the trial commenced.
data(BMD)
A data frame with 1,439 observations on the following 9 variables.
subj
Subject ID
month
Months since start of trial (0, 12, 24)
group
Treatment group (1, 2, 3)
bmd
Bone mineral density at hip (g/cm^2)
smoking
Smoking status (1=No, 2=Yes (<10 per day), 3=10+ per day)
hrt
Yes or No
bmi
Body mass index (kg/m^2)
yrs
Number of years since menopause
age
Age at start of trial
Nand SL, Wren BG, Gross B, Heller GZ (1999). Bone Density Effects of Continuous Estrone Sulfate and Varying Doses of Medroxyprogesterone Acetate, Obstetrics and Gynecology, 93(6), 1009-1013.
data(BMD) use(BMD) des() aggregate.plot(bmd, month, group) boxplot(bmd~month:group, col=5:7, xaxt="n", las=1)