BRD2 and polycystic ovary syndrome: In order to analyze the relationship between FSH and other characters, we stratified all PCOS patients into four groups according to the upper (FSH = 8.78 IU/L) and lower limits (FSH = 3.85 IU/L) of the FSH detection range (FSH < 3.85, 3.85 ≤ FSH < 8.78, 8.78 ≤ FSH ≤ 10, FSH > 10, IU/L).