bpd: Bronchopulmonary Dysplasia (BPD) from low birth weight...

In ALA: Data sets and examples for the book "Applied Longitudinal Analysis"

Description

Data on Bronchopulmonary Dysplasia (BPD) from 223 low birth weight infants (weighing less than 1750 grams). The data are from a study of low birth weight infants in a neonatal intensive care unit.

Usage

data(bpd)

Format

A data frame with 223 observations on the following 5 variables.

id

a factor with 223 levels

bpd

a numeric vector

birth.weight

a numeric vector

gestational.age

a numeric vector

toxemia

a factor with levels no and yes

Details

The study was designed to examine the development of bronchopulmonary dysplasia (BPD), a chronic lung disease, in a sample of 223 infants weighing less than 1750 grams. The response variable is binary, denoting whether an infant develops BPD by day 28 of life (where BPD is defined by both oxygen requirement and compatible chest radiograph).

Note

Original variable names have been adapted to R conventions. Variable ID was added to identify individuals.

Source

http://biosun1.harvard.edu/~fitzmaur/ala

References

Van Marter LJ, Leviton A, Kuban KCK, Pagano M, Allred EN (1990) Maternal glucocorticoid therapy and reduced risk of bronchopulmonary dysplasia. Pediatrics 86:331-336.

Examples

str(bpd)
summary(bpd)

ALA documentation built on May 2, 2019, 5:39 p.m.