Statistical analysis
Statistical analysis was performed using STATA 15 (StataCorp., College
Station, TX, USA). Categorical data were compared usingX2 test or Fischer exact as appropriate and was
presented as number (%). For continuous variables distribution of the
data was judged by the Skewness and Kurtosis test. Wilcoxon rank sum
test was used for statistical analysis when the data was not normally
distributed; the continuous variables are presented as median and
interquartile ranges.
The risk ratios (RR) and 95% CI were estimated using the non SGA group
as the reference group. Sensitivity, specificity, and positive and
negative predictive values for the primary and secondary outcomes using
these fetal weight standards were calculated. The discriminatory ability
of each fetal growth chart was compared using area under receiver
operating characteristic curves (AUC). A p value < .05 was
consider significant.