Objective To categorize growth and correlate growth categories with morbidities in infants born before 32 weeks of gestation. Study design This retrospective study categorized weight growth by correlating mean growth velocity (GV) with growth trajectory z-score changes (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\Delta {GTZ}$</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Δ</mi> <mi>G</mi> <mi>T</mi> <mi>Z</mi> </math></EquationSource> </InlineEquation>), as measured using 2023 Postnatal Growth Charts for Preterm Infants. The associations between weight categories and morbidities were assessed. Results Weight gain of infants without morbidities was categorized into three groups based on correlating <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\Delta {GTZ}$</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Δ</mi> <mi>G</mi> <mi>T</mi> <mi>Z</mi> </math></EquationSource> </InlineEquation> with mean GV: slower (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\Delta {GTZ}$</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Δ</mi> <mi>G</mi> <mi>T</mi> <mi>Z</mi> </math></EquationSource> </InlineEquation> < –0.1), in-parallel (<InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\Delta {GTZ}$</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Δ</mi> <mi>G</mi> <mi>T</mi> <mi>Z</mi> </math></EquationSource> </InlineEquation> –0.1 to 0.3), and faster (<InlineEquation ID="IEq5"> <EquationSource Format="TEX">$\Delta {GTZ}$</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Δ</mi> <mi>G</mi> <mi>T</mi> <mi>Z</mi> </math></EquationSource> </InlineEquation> > 0.3). The proportions of infants with and without morbidities in these categories were evaluated across two distinct cohorts, revealing similar patterns. Both slower and faster growth were associated with bronchopulmonary dysplasia, while only slower growth was associated with retinopathy of prematurity. Conclusion Using the 2023 Postnatal Growth Charts for Preterm Infants, this study presents an alternative method for weight growth categorization.

Categorizing weight growth of infants born before 32 weeks’ gestation using the 2023 postnatal growth charts for preterm infants

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2025年8月12日

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Fu-Sheng Chou,
Hung-Wen Yeh,
Crystal Hsueh,
Jing Zhang,
Maria Fe B. Villosis,
Karine Barseghyan,
Ashwini Lakshmanan,
Reese H. Clark

摘要

Objective

To categorize growth and correlate growth categories with morbidities in infants born before 32 weeks of gestation.

Study design

This retrospective study categorized weight growth by correlating mean growth velocity (GV) with growth trajectory z-score changes ( $\Delta {GTZ}$ $Δ G T Z$ ), as measured using 2023 Postnatal Growth Charts for Preterm Infants. The associations between weight categories and morbidities were assessed.

Results

Weight gain of infants without morbidities was categorized into three groups based on correlating $\Delta {GTZ}$ $Δ G T Z$ with mean GV: slower ( $\Delta {GTZ}$ $Δ G T Z$ < –0.1), in-parallel ( $\Delta {GTZ}$ $Δ G T Z$ –0.1 to 0.3), and faster ( $\Delta {GTZ}$ $Δ G T Z$ > 0.3). The proportions of infants with and without morbidities in these categories were evaluated across two distinct cohorts, revealing similar patterns. Both slower and faster growth were associated with bronchopulmonary dysplasia, while only slower growth was associated with retinopathy of prematurity.

Conclusion

Using the 2023 Postnatal Growth Charts for Preterm Infants, this study presents an alternative method for weight growth categorization.