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Table 1 Demographic and obstetric characteristics of pregnant women before and after the Universal Two-Child Policy

From: Epidemiological characteristics and risk factors of obstetric infection after the Universal Two-Child Policy in North China: a 5-year retrospective study based on 268,311 cases

Demographic and obstetric characteristics

2013–2015

(n = 149,217)

2016–2017

(n = 119,094)

χ2

P

Age group (years)

  

3927.778

 < 0.01

 < 20

2265 (1.52)

1310 (1.10)

  

 20–

34,289 (22.98)

17,999 (15.11)

  

 25–

69,322 (46.46)

54,919 (46.12)

  

 30–

31,442 (21.07)

30,761 (25.83)

  

 35–

9704 (6.50)

12,032 (10.10)

  

 ≥ 40

2195 (1.47)

2073 (1.74)

  

Pregnancy complications

  

1440.260

 < 0.01

 Anemia

22,412 (70.84)

47,337 (79.35)

  

 Diabetes

3717 (11.75)

6626 (11.11)

  

 Nephropathy

358 (1.13)

401 (0.67)

  

 Hepatopathy

446 (1.41)

693 (1.16)

  

 Chronic hypertension

780 (2.47)

1186 (1.99)

  

 Mild preeclampsia

1116 (3.53)

947 (1.59)

  

 Severe preeclampsia

2810 (8.88)

2464 (4.13)

  

Parity

  

418.597

 < 0.01

 < 1

83,318 (55.84)

51,522 (43.26)

  

 ≥ 1

65,899 (44.16)

67,572 (56.74)

  

History of cesarean section (Times)

  

2905.329

 < 0.01

 0

122,326 (81.98)

87,390 (73.38)

  

 ≥ 1

26,891 (18.02)

31,794 (26.62)

  

Frequency of pregnancy (Times)

  

3557.308

 < 0.01

 1

68,570 (45.95)

41,158 (34.56)

  

 > 1

80,647 (54.05)

77,936 (65.44)

  

Gestational weeks (weeks)

  

59.211

 < 0.01

 ≤ 27

3662 (2.45)

3175 (2.67)

  

 28–

1871 (1.25)

1560 (1.31)

  

 33–

6626 (4.44)

5931 (4.98)

  

 ≥ 37

137,058 (91.85)

108,428 (91.04)

  

Delivery mode

  

31.385

 < 0.01

 Vaginal delivery

69,380 (46.50)

56,665 (47.58)

  

 Cesarean section

76,863 (51.51)

60,127 (50.49)

  

 Abortion

2974 (1.99)

2302 (1.93)

  

Education grade

  

2619.692

 < 0.01

 Primary school and below

43,287 (29.01)

45,150 (37.91)

  

 Middle school

46,503 (31.16)

35,247 (29.60)

  

 College and above

59,427 (39.83)

38,697 (32.49)

  
  1. The data outside the bracket is the number of people, and the data inside the bracket is the constituent ratio (%); there are 7 cases missing in the obstetric infection group and 1533 cases missing in the non obstetric infection group