A study investigated whether babies take longer to learn to
crawl in cold months when they are often bundled in clothes that
restrict their movement, than in warmer months. The study sought an
association between babies' first crawling age and the average
temperature during the month they first try to crawl (about 6 months
after birth). Parents brought their babies into the University of
Denver Infant Study Center between 1988-1991 for the study. The
parents reported the birth month and age at which their child was
first able to creep or crawl a distance of four feet in one minute.
Data were collected on 208 boys and 206 girls (40 pairs of which
were twins)
Usage
data(crawl)
Arguments
Format
A data frame with 12 observations on the following 4 variables.