Embryo Density and Its Neutrality in Day-3 Embryo Development: A Retrospective Cohort Study

Table 1

Demographic and treatment cycle characteristics of all participants (n = 1568).

Characteristics	All
Maternal age (years, median, Q1–Q3)	33 (30–36)
Paternal age (years, median, Q1–Q3)	35 (31–38)
Maternal BMI (kg/m^2)	22.3 (20.3–25.4)
Antral follicles (number, median, Q1–Q3)	9 (5–14)
AMH (ng/ml, median, Q1–Q3)	2.88 (1.50–5.23)
Primary infertility^a, n (%)	7781 (49.7)
Length of stimulation (days, median, Q1–Q3)	10 (8–11)
Retrieved oocytes (number, median, Q1–Q3)	10 (5–15)
Long and antagonist protocol^b, n (%)	1221 (77.9)
Conventional IVF^c, n (%)	1044 (66.6)

AMH: anti-Müllerian hormone; IVF: in vitro fertilization and embryo transfer. ^aProportion of primary infertility. ^bProportion of long and antagonist protocol. ^cProportion of insemination by conventional IVF.