From: Association between serum vitamin A levels and premature ovarian insufficiency: a case–control, cross-sectional survey study
Control group
POI group
FSH (IU/L)
< 25 (n = 47)
25–40 (n = 8)
> 40 (n = 39)
Mean ± SD
Vitamin A/TC ratio
157.56 ± 35.21
144.95 ± 39.40
142.77 ± 35.64