Data are shown as the mean ± SD. For each analysis, the Gaussian distribution of results was tested using the D'Agostino & Pearson normality test (GraphPad Software version 9; GraphPad, San Diego, CA). Whenever the assumptions of normal distribution were not met, nonparametric statistical analyses were done. In Experiments 1 and 2, the significant differences were determined by the nonparametric Mann–Whitney U test. The endometrial HK2 mRNA transcription in categories I, IIA, and IIB was determined by using parametric one-way ANOVA followed by a Newman-Keuls comparison test. The results were considered significantly different when P < 0.05.
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