Intra- and interobserver reproducibility study of early fetal growth parameters

Authors

  • Bero O. Verburg,

    1. The Generation R Study Group, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
    2. Department of Epidemiology and Biostatistics, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
    3. Department of Obstetrics and Gynaecology, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
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  • Paul G. H. Mulder,

    1. Department of Epidemiology and Biostatistics, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
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  • Albert Hofman,

    1. Department of Epidemiology and Biostatistics, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
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  • Vincent W. V. Jaddoe,

    1. The Generation R Study Group, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
    2. Department of Epidemiology and Biostatistics, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
    3. Department of Paediatrics, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
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  • Jacqueline C. M. Witteman,

    1. Department of Epidemiology and Biostatistics, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
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  • Eric A. P. Steegers

    Corresponding author
    1. Department of Obstetrics and Gynaecology, Erasmus Medical Center, Sophia Children's Hospital, Rotterdam, The Netherlands
    • Department of Obstetrics and Gynaecology, Erasmus Medical Center, 3000 CA Rotterdam, The Netherlands.
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Abstract

Objective

To assess the intra- and interobserver reproducibility of fetal biometry measurements by transabdominal ultrasound in early pregnancy.

Methods

The study consisted of 21 singleton pregnancies with a gestational age between 9 and 14 weeks. Intraclass correlation coefficients (ICCs) and coefficients of variation (CVs) were calculated. Bland and Altman plots were computed to analyze agreement for measurements between and among observers. Limits of agreement ± 2 SD for the differences in fetal biometry measurements in proportions of the mean of the measurements were derived.

Results

High intra- and interobserver ICCs were found, ranging from 0.998, crown-rump length (CRL) to 0.982, femur length (FL) and CVs ranging from 1.4% (CRL) to 5.9% (FL). Limits of agreement in the Bland and Altman plots ranged from − 2.7 to 2.3% (CRL) difference from the mean to − 13 to 23% (FL) difference. Agreement for fetal biometry increased with fetal size.

Conclusions

This study demonstrated good reproducibility of most measurements of fetal biometry in early pregnancy by abdominal ultrasound. CRL and biparietal diameter (BPD) showed high reproducibility and agreement, and head circumference (HC) to a lesser extend, from 9 weeks of gestational age onwards. abdominal circumference (AC) is only reliable from circa 11 weeks onwards. FL has a poor reproducibility before 14 weeks of gestational age. Copyright © 2008 John Wiley & Sons, Ltd.

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