Table 5.  Information on neonates according to the weeks of resuming postpartum menstruation.

		< 72 weeks n = 701	≥ 72 weeks n = 61	P
Single or multiple birth	single birth	99.3 (696)	100 (61)	1.00
	multiple birth	0.7 (5)	0.0 (0)
Gender	male	49.4 (346)	50.8 (31)	0.83
	female	50.6 (355)	49.2 (30)
Apgar score	At 1 minute after birth	9.0 (8.0, 9.0)	9.0 (8.0, 9.0)	0.78
	At 5 minutes after birth	10.0 (9.0, 10.0)	10.0 (9.0, 10.0)	0.19
pH value of umbilical arterial blood		7.3 (7.3, 7.4)	7.3 (7.3, 7.3)	0.07
Birth weight (g)	≥ 2500g < 2500g	92.4 (648) 7.6 (53)	90.2 (55) 9.8 (6)	0.46
Physical anomalies up to 1 month after birth	No	78.7 (546)	72.9 (43)	0.30
	Yes	21.3 (148)	27.1 (16)
Disease diagnosed before 1 year of age	No	75.1 (522)	75.4 (46)	0.96
	Yes	24.9 (173)	24.6 (15)

Data are median (interquartile range) or % (n). Data were missing on apgar score (n = 6), pH value of umbilical arterial blood (n = 56), physical anomalies up to 1 month after birth (n = 9), disease diagnosed before 1 year of age (n = 6). Distribution normality was confirmed using the Shapiro–Wilk test. Calculated using the Mann–Whitney U test or Chi-squared test (2 × 2 groups).