Table 2 Characterization of model-derived estimates at birth (day of life 0) and during the initial weight loss phase

From: A comparative study of postnatal anthropometric growth in very preterm infants and intrauterine growth

Gestational Age Group

23

24

25

26

27

28

29

30

Birth Gestational Age Range

22w4d-23w3d

23w4d-24w3d

24w4d-25w3d

25w4d-26w3d

26w4d-27w3d

27w4d-28w3d

28w4d-29w3d

29w4d-30w3d

Female Infants

Birth Weight Distribution on the Postnatal Weight Modelsa

 <10 th percentile

0.5%

3.3%

7.7%

10.7%

11.8%

12.3%

12.4%

12.0%

 > 90 th percentile

1.5%

2.0%

3.8%

7.0%

7.8%

9.6%

10.2%

10.5%

DOL of Estimated Weight Nadirb (day)

4

4

4

4

4

4

4

4

Percent Loss between Estimated Birth Weight and Nadirb (%)

5.0

5.7

7.0

7.3

7.8

7.9

7.8

7.4

DOL when Estimated Birth Weight Regainedb (day)

9

9

9

10

10

10

10

10

Male Infants

Birth Weight Distribution on the Postnatal Weight Modelsa

 < 10 th percentile

1.0%

2.5%

6.9%

10.2%

11.3%

11.9%

11.6%

12.1%

 > 90 th percentile

1.1%

2.7%

3.9%

5.8%

8.2%

8.8%

8.8%

9.9%

DOL of Estimated Weight Nadirb (day)

4

4

4

4

4

4

4

4

Percent Loss between Estimated Birth Weight and Nadirb (%)

4.9

5.8

6.8

6.9

7.7

7.6

7.4

6.9

DOL when Estimated Birth Weight Regainedb (day)

8

9

9

9

10

10

10

10

  1. aThe percentage numbers were obtained by first calculating the corresponding percentiles of the birth weight measurement values using the postnatal growth models as the reference tool, followed by calculating the percentage of the percentiles that are less than 10 or greater than 90.
  2. bThe values used to calculate percent loss were derived from the estimates of the postnatal growth models, rather than the raw measurement values of the infants included in the study.
  3. DOL day of life, BW birth weight.
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