Statistical analysis
Group means were compared using one-way analysis of variance (with the least significant difference post-hoc test) for quantitative variables, and a chi-squared test for qualitative variables. Quantitative variables were expressed as the mean ± standard deviation, and qualitative variables were presented as frequencies and percentages. Multivariate logistic regression analysis (backward: conditional) was performed to compare adjusted odds ratios (OR) and 95% confidence intervals (CI) for the effect of various PCOS phenotypes on pregnancy outcomes in FET, adjusted by the variates of P < 0.05 in univariate logistic regression analysis.
All analyses were performed with the use of SPSS software (version 23.0). Two-sidedP values of less than 0.05 were considered to indicate statistically significant differences.