Figure 1:

Clinical pregnancy, singleton, and multiple pregnancy rates per intrauterine insemination (IUI) in patients of all ages (A), patients <38 years of age (B), 38–40 years of age (C), and 41–44 years of age (D). The total height of each column represents the total clinical pregnancy rate per IUI based on follicle number and further divided into singleton (blue) and multiples (yellow) per IUI. The yellow columns are also the absolute risk of a multiple gestation per IUI, further categorized by number of follicles (1–5) that are ≥14 mm on the day of ovulation trigger. Generalized estimating equations were used to adjust for multiple cycles per patient.