Fig. 1

Construction of the nomogram. A Forest plot of the multivariate logistic regression analysis results. B ROC curves for paternal age and basal LH. C Nomogram for predicting clinical pregnancy with low-grade blastocyst frozen–thawed transfer. BMI, body mass index; e2 estradiol; ET, embryo transfer; FSH, follicle-stimulating hormone; hCG, human chorionic gonadotropin; LH, luteinizing hormone; OR, odds ratio; ROC, receiver operating characteristic