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Associations between high PI values and hormones (estradiol, progesterone, prolactine. testosterone, follicle stimulating hormone) measured during the investigated cycle and age were evaluated. A high PI in uterine arteries in the follicular phase was associated with low estradiol (E2) and progesterone (P) levels in the studied cycle. In the luteal phase PI values of uterine arteries have no obvious association with E and P levels, and other vasoactive compounds influence the perfusion of uterus during this period. 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