Embryonic Heart Rate and Age

@article{Dubose1990EmbryonicHR,
  title={Embryonic Heart Rate and Age},
  author={Terry J. Dubose and James A. Cunyus and L F Johnson},
  journal={Journal of Diagnostic Medical Sonography},
  year={1990},
  volume={6},
  pages={151 - 157}
}
This study used linear regression analysis to show that embryonic heart rate (EHR) can be used in the clinical setting to provide an estimate of embryonic age that correlates well with the fetal crown-rump length age (CRL; r = 0.856). A regression was performed on data from 275 examinations in which an embryonic heart rate was recorded before the ninth menstrual week from a cross-sectional population of 1,136 examinations throughout pregnancy. In this analysis, EHR was used as the independent… 
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