babies: Data on maternal smoking and infant health
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babies

R Documentation

Data on maternal smoking and infant health

Description

Data on maternal smoking and infant health

Usage

babies

Format

A data frame of 1236 rows of individual mothers.

id: Identification number
pluralty: Marked 5 for single fetus, otherwise number of fetuses
outcome: Marked 1 for live birth that survived at least 28 days
date: Birth date where 1096 is January 1st, 1961
birthday: Birth date in mm-dd-yyyy format
gestation: Length of gestation in days, marked 999 if unknown
sex: Infant's sex, where 1 is male, 2 is female, and 9 is unknown
wt: Birth weight in ounces, marked 999 if unknown
parity: Total number of previous pregnancies including fetal deaths and stillbirths, marked 99 if unknown
race: Mother's race where 0-5 is white, 6 is Mexican, 7 is Black, 8 is Asian, 9 is mixed, and 99 is unknown
age: Mother's age in years at termination of pregnancy, 99=unknown
ed: Mother's education 0= less than 8th grade, 1 = 8th -12th grade - did not graduate, 2= HS graduate–no other schooling , 3= HS+trade, 4=HS+some college 5= College graduate, 6&7 Trade school HS unclear, 9=unknown
ht: Mother's height in inches to the last completed inch, 99=unknown
wt_1: Mother prepregnancy wt in pounds, 999=unknown
drace: Father's race, coding same as mother's race
dage: Father's age, coding same as mother's age
ded: Father's education, coding same as mother's education
dht: Father's height, coding same as for mother's height
dwt: Father's weight coding same as for mother's weight
marital: 0= legally separated, 1=married, 2= divorced, 3=widowed, 5=never married
inc: Family yearly income in $2500 increments 0 = under 2500, 1=2500-4999, ..., 8= 12,500-14,999, 9=15000+, 98=unknown, 99=not asked
smoke: Does mother smoke? 0=never, 1= smokes now, 2=until current pregnancy, 3=once did, not now, 9=unknown
time: If mother quit, how long ago? 0=never smoked, 1=still smokes, 2=during current preg, 3=within 1 yr, 4= 1 to 2 years ago, 5= 2 to 3 yr ago, 6= 3 to 4 yrs ago, 7=5 to 9yrs ago, 8=10+yrs ago, 9=quit and don't know, 98=unknown, 99=not asked
number: Number of cigs smoked per day for past and current smokers 0=never, 1=1-4, 2=5-9, 3=10-14, 4=15-19, 5=20-29, 6=30-39, 7=40-60, 8=60+, 9=smoke but don't know, 98=unknown, 99=not asked