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Monday, June 16, 2014

Trailers (85): Revised birth weight reference

Duryea et al. A revised birth weight reference for the United States

Why should you read about this topic?

Because we need reference data for definitions of SGA, LGA, and fetal growth restriction.

What were the authors trying to do?

Update the birth weight curves with contemporary methods of estimating gestational age

Who participated and in what setting?

Live born singleton infants (N=3,252,011) between 500-6000 grams and 24-42 weeks and no malformations born in states using the 2003 revision of the birth certificate collected by the National Center for Health Statistics in 2011

What was the study design?

Retrospective, population-based cross-sectional study

What were the main outcome measures?

Birth weight

What were the results?

New reference curves were generated showing lower birth weight between 28 to 36 weeks primarily due to better estimates of gestational age, compared with earlier reference curves

What is the most interesting image in the paper?

Figure 2

What were the study strengths and weaknesses?

Strengths: population-based; enormous number of births.  Weaknesses: derived from birth certificate data, particularly the obstetric estimate.

What does the study contribute for your practice?

Contemporary birth weight percentiles