Reproductive factors and subsequent pregnancy outcomes in patients with prior pregnancy loss

Table 1 Demographic Characteristics of Study Subjects in the pregnancy loss Cohort Study (n = 1955)

Variables	Number (n)	Variables	Number (n)
Age, years	30.51 ± 4.41	Live birth
Age, years		No	1555 (79.54%)
< 25	106 (5.42%)	Yes	400 (20.46%)
25~	769 (39.34%)	Delivery method
30~	753 (38.52%)	Vaginal delivery	268 (67.09%)
35~	327 (16.73%)	Caesarean section	132 (32.91%)
First pregnancy age	26.41 ± 3.74	Birth defects
< 25	543 (28.30%)	No	1882 (96.27%)
25~	1046 (54.51%)	Yes	73 (3.73%)
30~	284 (14.80%)	Ectopic pregnancy
35~	46 (2.40%)	No	1864 (95.35%)
BMI, kg/m²	22.39 ± 3.24	Yes	91 (4.65%)
BMI, kg/m²		Hydatidiform mole
< 18.5	155 (8.07%)	No	1935 (98.98%)
18.5~	1264 (65.80%)	Yes	20 (1.02%)
24~	395 (20.56%)	Menarche age	13.54 ± 1.29
28~	107 (5.57%)	Menstrual cycle
Total pregnancy numbers	2.36 ± 1.26	Regular	1636 (83.68%)
1	531 (27.16%)	Irregular	319 (16.32%)
2	701 (35.86%)	Dysmenorrhea
3	414 (21.18%)	no	760 (38.87%)
4	184 (9.41%)	mild	885 (45.27%)
≥ 5	125 (6.39%)	moderate	216 (11.05%)
Pregnancy loss numbers	1.89 ± 1.00	severe	94 (4.81%)
1	799 (40.87%)	previous pelvic surgery
2	750 (38.36%)	No	1693 (86.60%)
3	278 (14.22%)	Yes	262 (13.40%)
≥ 4	128 (6.55%)	Degree of education
Induced abortion		Primary school degree	57 (2.92%)
0	1727 (88.34%)	High school degree	606 (31.00%)
1	179 (9.16%)	A college degree	1236 (63.22%)
≥ 2	49 (2.51%)	Graduate degree	56 (2.86%)
Pregnancy loss type		Ethnic
Primary	1531 (78.31%)	Han	1763 (90.18%)
Secondary	424 (21.69%)	Hui	110 (5.63%)
		Zang	36 (1.84%)
		others	46 (2.35%)

Continuous variables are described as the mean ± standard deviation, categorical variables are expressed as numbers and percentages

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