Fig. 1From: Effect of follicle size on pregnancy outcomes in patients undergoing first letrozole-intrauterine inseminationA restricted cubic spline showed an inverted U-shaped relationship between the size of primary follicles and pregnancy outcomes. A Pregnancy rate. B Clinical pregnancy rate. C Live birth rate. Additionally adjusted for Age, BMI, infertility type, duration of infertility, Primary diagnosis, endometrium thickness, FSH, AMH, TMC, E2 on the day of hCG trigger and LH surgeBack to article page