Higher preconceptional maternal body mass index is associated with faster early preimplantation embryonic development: the Rotterdam periconception cohort

Table 1 Baseline characteristics of the VIRTUAL EmbryoScope study population (n = 268)

	Normal weight women		Overweight women		Obese women		P-value	Missing
	N = 143		N = 79		N = 43
	Median/N	IQR/%	Median/N	IQR/%	Median/N	IQR/%
Maternal factors
Age, years	34.3	30.5–38.3	32.9	29.2–36.6	36.3	30.3–39.6	0.110	0
Geographic origin, Western	119	83.3	68	86.1	37	80.4	0.709	1
Eductional level							0.004	1
Low	6	4.2	6	7.6	5	10.9
Intermediate	47	33.1	27	58.7	32	40.5
High	89	62.7	41	51.9	14	30.4
Folic acid supplements, yes	135	95.1	75	94.9	42	91.3	0.632	1
Vitamins, yes	80	60.6	37	50.7	17	41.5	0.073	22
Alcohol, yes	63	44.4	27	34.2	18	39.1	0.328	1
Cigarettes, yes	19	13.4	12	15.2	7	15.2	0.914	1
Treatment factors
Cause of subfertility							0.987	0
Female factor	44	30.8	22	27.8	12	26.1
Male factor	51	35.7	30	38.0	17	37.0
Combined	28	19.6	17	21.5	9	19.6
Unexplained	20	14.0	10	12.7	8	17.4
ICSI, yes	79	55.2	50	63.3	28	60.9	0.478	0
Oocytes aspirated	8	5–12	9	6–14	8	5–12	0.278	2
Ovarian stimulation, GnRH-agonist	26	18.2	18	22.8	12	26.1	0.459	0

ISSN: 1477-7827