Fig. 1.
The first-month procedure of ART. COH, controlled ovarian hyperstimulation; ET, embryo transfer; GnRH, gonadotropin-releasing hormone; OI, ovulation induction (the end of COH); OR, oocyte retrieval; and PT, pregnancy tests. Subgroup “Hypothyroid” was defined as with a certified diagnosis of clinical or subclinical hypothyroidism