Lower pregnancy rate in women with high uterine peristalsis before embryo transfer: a systematic review and meta-analysis

Table 3 Characteristics of UP frequency, direction and amplitude of UC in different phases of the menstrual cycle (van Gestel et al., 2003) [37]

Phase	Subphase	Frequency (contractions/min)	Amplitude (mmHg)	Direction
Menstruation		0.33–3.0	13.6	FC
Follicular phase	Mild	1.5–3.3	5.2	FC/CF
Follicular phase	Late	3.0–6.0	2.9	CF
Luteal phase	Early	2.0–4.0	Amplitude rises
Luteal phase	Late	0.8–1.8	CF/opposing	Opposing/no contractions

Abbreviations: CF cervix to fundus, FC fundus to cervix, opposing = Contractions are initiating both in the cervical and fundal regions, UP uterine peristalsis, UC uterine contraction

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