Birth weight, date, and gestational period collected as part of the Child Health and Development Studies in 1961 and 1962. Information about the baby's parents --- age, education, height, weight, and whether the mother smoked is also recorded.
data(Gestation)A data frame with 1236 observations on the following variables.
ididentification number
pluralityall "single fetus" in this data set
outcomeall "live birth" (survived at least 28 days) in this data set
datebirth date where 1096=January 1, 1961
gestationlength of gestation (in days)
wtbirth weight (in ounces)
paritytotal number of previous pregnancies (including fetal deaths and still births)
sex"male"
racemother's race: "asian", "black", "mex", "mixed", or "white"
agemother's age in years at termination of pregnancy
edmother's education
htmother's height in inches to the last completed inch
wt.1mother's prepregnancy weight (in pounds)
dracefather's race
dagefather's age (in years)
dedfather's education
dhtfather's height in inches to the last completed inch
dwtfather's weight (in pounds)
maritalmarital status
incfamily yearly income in $2500 increments
smokedoes mother smoke? (never, smokes now, until current pregnancy, once did, not now)
timetime since quitting smoking (never smoked, still smokes, during current preg, within 1 year, 1 to 2 years ago, 2 to 3 years ago, 3 to 4 years ago, 5 to 9 years ago, 10+ years ago, quit and don't know
numbernumber of cigarettes smoked per day for past and current smokers (never, 1-4, 5-9, 10-14, 15-19, 20-29, 30-39, 40-60, 60+, smoke but don't know)
The data were presented by Nolan and Speed to address the question of whether there is a link between maternal smoking and the baby's health for male births.
D Nolan and T Speed. Stat Labs: Mathematical Statistics Through Applications (2000), Springer-Verlag.