Letter to the Editor regarding “The impacts of placental localization and fetal sex on the estimation of fetal weight”

We have read the article of Çintesun et al. with the title of "The impacts of amniotic fluid index, placental localization and fetal sex on the estimation of fetal weight" with a great interest. We would like to contribute to this article by analyzing the impacts of placental localization and fetal sex on the estimation of fetal weight in patients delivered in our clinic. The records of the patients who delivered at the Gynecology and Obstetrics Clinic of Gülhane Training and Research Hospital between June 1 and November 15, 2017 were analyzed retrospectively. The method of measuring fetal weight and inclusion criteria were determined similar to the related study. The measurements were done by using the same ultrasonography device (SIUI, Shantou Institute of Ultrasonic Instruments Co., Ltd., Shantou, China). A total of 257 patients were included in the study. In the statistical analyses, number, percentage, arithmetic mean and standard deviation were used for the distributions of data, and Kruskal-Wallis and Mann-Whitney U tests were used for statistical comparisons. In this study, mean age was 29.26±5.5 years, gravida median was 2, parity mean was 1, and weeks of gestation were 39.1 (range: 35 to 42). It was found in the patients that cesarean section was 39.68%, normal delivery rate was 60.31%, mean ultrasonographic estimation of fetal weight was 3261.08± 4.81 g, and mean birth weight was 3338.48±4.84 g. The demographic and clinical data of the patients are shown in the Table 1. Similar to the study of Çintesun et al., we calculated error percentage in ultrasonographic estimation of fetal weight measurement, and considered it as “weight deficit”. Total weight deficit in all patients was 1.69%. While the deficit was -7.57% in females, it was 2.85% in males (Table 2). Our results are different than