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)

Format

A data frame with 1236 observations on the following variables.

  • id identification number

  • plurality all "single fetus" in this data set

  • outcome all "live birth" (survived at least 28 days) in this data set

  • date birth date where 1096=January 1, 1961

  • gestation length of gestation (in days)

  • wt birth weight (in ounces)

  • parity total number of previous pregnancies (including fetal deaths and still births)

  • race mother's race: "asian", "black", "mex", "mixed", or "white"

  • age mother's age in years at termination of pregnancy

  • ed mother's education

  • ht mother's height in inches to the last completed inch

  • wt.1 mother's prepregnancy weight (in pounds)

  • drace father's race

  • dage father's age (in years)

  • ded father's education

  • dht father's height in inches to the last completed inch

  • dwt father's weight (in pounds)

  • marital marital status,

  • inc family yearly income in $2500 increments

  • smoke does mother smoke? (never, smokes now, until current pregnancy, once did, not now)

  • time time 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

  • number number 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)

Source

The book by Nolan and Speed describes the data in more detail and provides an Internet site for accessing them: https://www.stat.berkeley.edu/users/statlabs/

Details

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.

References

D Nolan and T Speed. Stat Labs: Mathematical Statistics Through Applications (2000), Springer-Verlag.

Examples

data(Gestation)