Causal models for monitoring the progress of infants with low birthweight
File(s)
Accepted version
Author(s)
Longford, NT
Ramirez, O
Giffe, C
Longford, NT
Type
Journal Article
Abstract
We study the weight (body mass) of infants born premat
urely and with low
birthweight during the first postnatal year. The infants are
enrolled in the Casa Canguro
programme in Valle de Cauca, a department (province) of Colom
bia. The current weight
and other physiological measurements are recorded at their vi
sits to participating health-
care facilities. We compare two groups of infants: those bor
n at 31 weeks of gestational
age or earlier (extremely preterm) and those born at 33 weeks or
later (preterm). The
comparisons are made using the potential outcomes framewor
k, regarding the two groups
as treatments and selecting from them pairs matched on an exte
nsive set of covariates.
Matching is accomplished by propensity scoring. The outcom
es (weight and height)
at a particular age are approximated by interpolation.
We conclude that the average
weight-handicap of the extremely preterm infants first incre
ases, from about 600 grams
at birth to 900 grams on average at three months, and then is re
duced, so that by the
first birthday they are only about 250 grams lighter on averag
e.
urely and with low
birthweight during the first postnatal year. The infants are
enrolled in the Casa Canguro
programme in Valle de Cauca, a department (province) of Colom
bia. The current weight
and other physiological measurements are recorded at their vi
sits to participating health-
care facilities. We compare two groups of infants: those bor
n at 31 weeks of gestational
age or earlier (extremely preterm) and those born at 33 weeks or
later (preterm). The
comparisons are made using the potential outcomes framewor
k, regarding the two groups
as treatments and selecting from them pairs matched on an exte
nsive set of covariates.
Matching is accomplished by propensity scoring. The outcom
es (weight and height)
at a particular age are approximated by interpolation.
We conclude that the average
weight-handicap of the extremely preterm infants first incre
ases, from about 600 grams
at birth to 900 grams on average at three months, and then is re
duced, so that by the
first birthday they are only about 250 grams lighter on averag
e.
Date Issued
2020-09-24
Date Acceptance
2016-10-20
Citation
Revista Brasileira de Biometria -- Brasilian Biometric Journal, 2020, 35 (3), pp.600-633
ISSN
0102-0811
Publisher
Universidade Estadual Paulista * Fundacao Editora U N E S P
Start Page
600
End Page
633
Journal / Book Title
Revista Brasileira de Biometria -- Brasilian Biometric Journal
Volume
35
Issue
3
Copyright Statement
© 2016 The Authors. This paper is embargoed until publication.
Identifier
http://www.biometria.ufla.br/index.php/BBJ/article/view/79
Subjects
0101 Pure Mathematics
Publication Status
Published
Date Publish Online
2017-09-29