Data from the Child Health and Development Studies

Description

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.

Usage

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)

sex

"male"

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)

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.

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/

References

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

Examples

data(Gestation)