Table 2.

Maternal and treatment characteristics according to transfer day

	Day 3 (n = 93)	Day 5 (n = 115)	p value
Mean maternal age (SD)	30.9 (3.9)	31.0 (3.7)	0.86
Median maternal BMI (IQR)	22.9 (20.0, 25.8)	22.8 (20.3, 26.0)	0.76
Maternal parity
Nulliparous (%)	75 (80.6)	88 (76.5)	0.47
Multiparous (%)	18 (19.4)	27 (23.5)
Maternal smoking
Non-smoker (%)	78 (88.6)	100 (87.7)	0.84
Smoker (%)	10 (11.4)	14 (12.3)
Number of embryos transferred
Single (%)	44 (47.3)	60 (52.2)	0.49
Two or more (%)	49 (52.7)	55 (47.8)

Maternal age was compared by two-sample t test; maternal BMI was compared by Wilcoxon rank-sum test; and categorical variables were compared by Pearson’s chi-squared test