A Test of Agreement of Customised Birthweight Models

Background The objective of this study was to determine whether the physiological effects on birthweight as described by customised birthweight models (CBMs) from various populations and locations are consistent when applied to a single sample. Methods The predicted birthweight was calculated for 52 826 White‐European singleton term births between 1997 and 2008 from a large Australian hospital using the same set of variables from 12 published CBMs. The accuracy of prediction was tested against both the actual birthweight and a reference model. Intraclass correlation coefficients (ICCs) along with 95% confidence intervals of the measurements, paired differences (predicted–actual birthweight) and absolute values of the paired differences are reported. Results The average difference in predicted and actual birthweight was