The length of pregnancy: an echographic reappraisal.

@article{Todros1991TheLO,
  title={The length of pregnancy: an echographic reappraisal.},
  author={Tullia Todros and Giorgio Ronco and Diana T. Lombardo and Luigi Gagliardi},
  journal={Journal of clinical ultrasound : JCU},
  year={1991},
  volume={19 1},
  pages={
          11-4
        }
}
A study of 998 pregnant women was conducted to estimate the random errors in dating pregnancy by menstrual history and by ultrasound measurements of the fetus (crown-rump length or biparietal diameter before 20 weeks, menstrual age) as well as the biological variability of pregnancy length. The latter was found to be 7.74 days. The random errors made when dating pregnancy by menstrual history and by ultrasound measurements were 7.16 days and 4.26 days, respectively. (All variabilities are… CONTINUE READING
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