Statistical analysis
All statistical analyzes were performed using IBM SPSS Statistics 21.0
(IBM Corp. Armonk, NY). Numerical variables were expressed as standard
deviations and means. The Kolmogorov-Smirnov test was used to interpret
the relationship of the data to the normal distribution. The parametric
t-test for independent samples and the nonparametric Mann-Whitney U test
were used to compare statistical significance between two independent
groups in relation to the distribution ranges. Spearman and Pearson
correlation tests were performed to evaluate the relationship between
the two quantitative variables according to their distribution ratios.
Receiver operating characteristic analysis (ROC) was performed to
determine the predictive value of EFT for GDM. P values of less than
0.05 were interpreted as statistically significant.