Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study
Objective. To compare birth weight ratio and birth weight percentile to express infant weight when assessing pregnancy outcome. Study Design. We performed a national cohort study. Birth weight ratio was calculated as the observed birth weight divided by the median birth weight for gestational age. T...
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doaj-f9320baee11347e0a14c5a5545e663562020-11-25T00:11:35ZengHindawi LimitedObstetrics and Gynecology International1687-95891687-95972014-01-01201410.1155/2014/749476749476Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort StudyBart Jan Voskamp0Brenda M. Kazemier1Ewoud Schuit2Ben Willem J. Mol3Maarten Buimer4Eva Pajkrt5Wessel Ganzevoort6Department of Obstetrics and Gynecology, Room H4-232, Meibergdreef 9, Academic Medical Center, 1105 AZ Amsterdam, The NetherlandsDepartment of Obstetrics and Gynecology, Room H4-232, Meibergdreef 9, Academic Medical Center, 1105 AZ Amsterdam, The NetherlandsDepartment of Obstetrics and Gynecology, Room H4-232, Meibergdreef 9, Academic Medical Center, 1105 AZ Amsterdam, The NetherlandsThe Robinson Institute, School of Paediatrics and Reproductive Health, University of Adelaide, Adelaide, SA 5005, AustraliaDepartment of Obstetrics and Gynecology, Skaraborgs Sjukhus, Skövde, 541 85 Västra Götaland, SwedenDepartment of Obstetrics and Gynecology, Room H4-232, Meibergdreef 9, Academic Medical Center, 1105 AZ Amsterdam, The NetherlandsDepartment of Obstetrics and Gynecology, Room H4-232, Meibergdreef 9, Academic Medical Center, 1105 AZ Amsterdam, The NetherlandsObjective. To compare birth weight ratio and birth weight percentile to express infant weight when assessing pregnancy outcome. Study Design. We performed a national cohort study. Birth weight ratio was calculated as the observed birth weight divided by the median birth weight for gestational age. The discriminative ability of birth weight ratio and birth weight percentile to identify infants at risk of perinatal death (fetal death and neonatal death) or adverse pregnancy outcome (perinatal death + severe neonatal morbidity) was compared using the area under the curve. Outcomes were expressed stratified by gestational age at delivery separate for birth weight ratio and birth weight percentile. Results. We studied 1,299,244 pregnant women, with an overall perinatal death rate of 0.62%. Birth weight ratio and birth weight percentile have equivalent overall discriminative performance for perinatal death and adverse perinatal outcome. In late preterm infants (33+0–36+6 weeks), birth weight ratio has better discriminative ability than birth weight percentile for perinatal death (0.68 versus 0.63, P 0.01) or adverse pregnancy outcome (0.67 versus 0.60, P<0.001). Conclusion. Birth weight ratio is a potentially valuable instrument to identify infants at risk of perinatal death and adverse pregnancy outcome and provides several advantages for use in research and clinical practice. Moreover, it allows comparison of groups with different average birth weights.http://dx.doi.org/10.1155/2014/749476 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bart Jan Voskamp Brenda M. Kazemier Ewoud Schuit Ben Willem J. Mol Maarten Buimer Eva Pajkrt Wessel Ganzevoort |
spellingShingle |
Bart Jan Voskamp Brenda M. Kazemier Ewoud Schuit Ben Willem J. Mol Maarten Buimer Eva Pajkrt Wessel Ganzevoort Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study Obstetrics and Gynecology International |
author_facet |
Bart Jan Voskamp Brenda M. Kazemier Ewoud Schuit Ben Willem J. Mol Maarten Buimer Eva Pajkrt Wessel Ganzevoort |
author_sort |
Bart Jan Voskamp |
title |
Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study |
title_short |
Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study |
title_full |
Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study |
title_fullStr |
Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study |
title_full_unstemmed |
Birth Weight Ratio as an Alternative to Birth Weight Percentile to Express Infant Weight in Research and Clinical Practice: A Nationwide Cohort Study |
title_sort |
birth weight ratio as an alternative to birth weight percentile to express infant weight in research and clinical practice: a nationwide cohort study |
publisher |
Hindawi Limited |
series |
Obstetrics and Gynecology International |
issn |
1687-9589 1687-9597 |
publishDate |
2014-01-01 |
description |
Objective. To compare birth weight ratio and birth weight percentile to express infant weight when assessing pregnancy outcome. Study Design. We performed a national cohort study. Birth weight ratio was calculated as the observed birth weight divided by the median birth weight for gestational age. The discriminative ability of birth weight ratio and birth weight percentile to identify infants at risk of perinatal death (fetal death and neonatal death) or adverse pregnancy outcome (perinatal death + severe neonatal morbidity) was compared using the area under the curve. Outcomes were expressed stratified by gestational age at delivery separate for birth weight ratio and birth weight percentile. Results. We studied 1,299,244 pregnant women, with an overall perinatal death rate of 0.62%. Birth weight ratio and birth weight percentile have equivalent overall discriminative performance for perinatal death and adverse perinatal outcome. In late preterm infants (33+0–36+6 weeks), birth weight ratio has better discriminative ability than birth weight percentile for perinatal death (0.68 versus 0.63, P 0.01) or adverse pregnancy outcome (0.67 versus 0.60, P<0.001). Conclusion. Birth weight ratio is a potentially valuable instrument to identify infants at risk of perinatal death and adverse pregnancy outcome and provides several advantages for use in research and clinical practice. Moreover, it allows comparison of groups with different average birth weights. |
url |
http://dx.doi.org/10.1155/2014/749476 |
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