title: A new mathematical formula to predict the foetal weight in twin pregnancies: A comparison of it with 19 different formulas.
abstract: One hundred and seventy-two twin-pregnant patients were enrolled. The estimated foetal weight was calculated using 19 different formulas. Ong's formula (0.954 (95%CI = 0.938/0.966)), which was designed specifically for twins, produced the highest Cronbach's alpha value followed by Hadlock II (0.952 (95%CI = 0.935/0.965)), Hadlock I (0.952 (95%CI = 0.935/0.964)), Hadlock III (0.952 (95%CI = 0.935/0.964)), Hadlock IV (0.952 (95%CI = 0.935/0.964)) and our formula (0.952 (95%CI = 0.935/0.964)), which produced the same Cronbach's alpha values for twin A. For twin B, our formula produced the highest Cronbach's alpha value (0.961 (95%CI = 0.948/0.972) followed by Hadlock II (0.960 (95%CI = 0.946/0.971)), Hadlock I (0.960 (95%CI = 0.946/0.970)), Hadlock III (0.960 (95%CI = 0.946/0.970)) and Hadlock IV (0.960 (95%CI = 0.946/0.970)). In conclusion, our formula (AC, FL) performed well in predicting the foetal weights in twin pregnancies (>24 weeks) in our study. However, it should be tested in other populations. Hadlock II (AC, FL) produced a comparable performance to Hadlock I (BPD, HC, AC, FL), Hadlock III (BPD, AC, FL) and Hadlock IV (HC, AC, FL). Hadlock II may be preferable in twin pregnancies since it is based on AC and FL only.
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Deniz
authors.initials: D
authors.lastname: Esinler
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Oya Bircan
authors.initials: OB
authors.lastname: Aldemir
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Ebru
authors.initials: E
authors.lastname: Alici Davutoglu
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Ertugrul
authors.initials: E
authors.lastname: Karahanoglu
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Kerime Nazli
authors.initials: KN
authors.lastname: Salihoglu
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Ebru
authors.initials: E
authors.lastname: Kuzu
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Neslihan
authors.initials: N
authors.lastname: Yerebasmaz
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Omer
authors.initials: O
authors.lastname: Kandemir
authors.affiliation: a Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine , Etlik Zubeyde Hanim Maternity Hospital , Ankara , Turkey.
authors.forename: Serdar
authors.initials: S
authors.lastname: Yalvac
mesh_terms: D000328:Adult; D001699:Biometry / Q000379:methods*; D001724:Birth Weight; D005260:Female; D020567:Fetal Weight; D005865:Gestational Age; D006801:Humans; D008962:Models, Theoretical; D011237:Predictive Value of Tests; D011247:Pregnancy; D059285:Pregnancy, Twin; D012044:Regression Analysis; D012189:Retrospective Studies; D014427:Twins; D016216:Ultrasonography, Prenatal / Q000706:statistics & numerical data*
keywords: Foetal weight assessment; birth weight; foetal weight estimation; prenatal ultrasonography; twin pregnancy