We thank Dr DeVore [Citation1] for his interest in our 2016 paper [Citation2]. Indeed, in the construction of there was an error due to a shift between colons. Similarly, Dr DeVore is describing the 3rd quantile used t values instead of absolute values [Citation1]. We hereby provided the correction of this issue by enclosing the correct coefficients reported in the new and we reported the absolute values of umbilical vein diameter for each quantile between 14 and 40 weeks of gestation () that reflect data reported in figure 1A of 2016 manuscript [Citation1]. Concerning the y-axis of figure 1D it was generated without decimals. We provide now a new version () with one decimal.
Figure 1. Scatterplot of the data and fitted 5th, 50th, and 95th values obtained by quantile regression of UV diameter.
Table 1. Fitted polynomial quantile regression coefficients for UV diameter.
Table 2. Reference limits for gestation (3–97 quantiles) for umbilical vein diameter.
Department of Obstetrics and Gynecology, Fondazione Policlinico Tor Vergata, Università di Roma Tor Vergata, Rome, Italy
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References
- DeVore GR. Equation errors for umbilical vein diameter in “modelling umbilical vein blood flow normograms at 14–40 weeks of gestation by quantile regression analysis”. J Matern Fetal Neonatal Med. 2022;35(25):9398.
- Rizzo G, Rizzo L, Aiello E, et al. Modelling umbilical vein blood flow normograms at 14–40 weeks of gestation by quantile regression analysis. J Matern Fetal Neonatal Med. 2016;29(5):701–706.