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Table 1 Descriptive Statistics of potential covariables among Wenchuan exposure and non-exposure group

From: Maternal exposure to Wenchuan earthquake and prolonged risk of offspring birth outcomes: a natural experiment study

 

No. (Weighted %)

  

Characteristic

Total

Exposure

Non-exposure

χ2

P value

Maternal age

 < 20 years

1093 (2.39)

93 (2.70)

1000 (2.38)

1.94

0.413

 20–34 years

63,948 (86.41)

2933 (86.70)

61,015 (86.40)

  

 > 34 years

8364 (11.20)

386 (10.60)

7978 (11.22)

  

Maternal education

 Low

16,763 (36.38)

911 (35.34)

15,852 (36.41)

9.83

< 0.001

 Middle

29,302 (39.70)

1144 (44.18)

28,158 (39.56)

  

 High

19,846 (23.93)

529 (20.48)

19,317 (24.03)

  

Hukou

 Local

62,833 (87.15)

3303 (96.73)

59,530 (86.81)

230.02

< 0.001

 Migrant

10,150 (12.85)

101 (3.27)

10,049 (13.19)

  

Pre-pregnant BMI

 Underweight

6769 (12.95)

266 (15.18)

6503 (12.90)

6.89

0.001

 Healthy weight

39,463 (72.49)

1208 (73.37)

38,255 (72.47)

  

 Overweight/Obese

8105 (14.56)

184 (11.45)

7921 (14.64)

  

History of preterm

 Yes

899 (1.47)

34 (1.04)

865 (1.48)

3.01

0.083

 No

72,388 (98.53)

3370 (98.96)

69,018 (98.52)

  

Artificial Conception

 Yes

4690 (6.47)

128 (3.33)

4562 (6.58)

50.10

< 0.001

 No

68,491 (93.53)

3287 (96.67)

65,204 (93.42)

  

Parity

 Primiparous

41,207 (47.37)

1790 (52.69)

39,417 (47.18)

28.09

< 0.001

 Multiparous

32,062 (52.63)

1613 (47.31)

30,449 (52.82)

  

Diabetes

 Yes

770 (0.90)

38 (0.98)

732 (0.90)

0.19

0.664

 No

72,276 (99.10)

3368 (99.02)

68,908 (99.10)

  

Heart disease

 Yes

278 (0.32)

21 (0.53)

257 (0.32)

2.78

0.095

 No

72,998 (99.68)

3393 (99.47)

69,605 (99.68)

  

Renal disease

 Yes

121 (0.13)

4 (0.10)

117 (0.13)

0.14

0.708

 No

73,211 (99.87)

3410 (99.90)

69,801 (99.87)

  

Autoimmune disease

 Yes

206 (0.16)

23 (0.69)

183 (0.14)

52.33

< 0.001

 No

72,764 (99.84)

3391 (99.31)

69,373 (99.86)

  

Hyperthyroidism

 Yes

270 (0.39)

15 (0.44)

255 (0.38)

0.19

0.663

 No

72,661 (99.61)

3396 (99.56)

69,265 (99.62)

  

Hypothyroidism

 Yes

991 (0.88)

34 (1.13)

957 (0.87)

1.72

0.190

 No

71,922 (99.12)

3377 (98.87)

68,545 (99.13)

  

Asthma

 Yes

57 (0.05)

2 (0.06)

55 (0.05)

0.12

0.732

 No

73,232 (99.95)

3411 (99.94)

69,821 (99.95)

  

Gestational Diabetes

 Yes

7372 (11.43)

173 (5.99)

7199 (11.63)

64.48

< 0.001

 No

65,017 (88.57)

3234 (94.01)

61,783 (88.37)

  

Gestational hypertension

 Yes

3415 (4.16)

149 (4.06)

3266 (4.17)

0.06

0.802

 No

69,004 (95.84)

3233 (95.94)

65,771 (95.83)

  

Gestational anemia

 Yes

9293 (13.26)

147 (4.90)

9146 (13.55)

167.22

< 0.001

 No

64,029 (86.74)

3268 (95.10)

60,761 (86.45)

  

Gestational hyperthyroidism

 Yes

300 (0.32)

10 (0.27)

290 (0.32)

0.20

0.658

 No

72,636 (99.68)

3405 (99.73)

69,231 (99.68)

  

Gestational hypothyroidism

 Yes

2024 (1.90)

58 (2.16)

1966 (1.90)

0.73

0.394

 No

70,910 (98.10)

3357 (97.84)

67,553 (98.10)

  

Gestational asthma

 Yes

45 (0.05)

1 (0.02)

44 (0.05)

0.69

0.407

 No

73,350 (99.95)

3414 (99.98)

69,936 (99.95)

  

Multiple pregnancy

 Yes

1569 (1.78)

105 (2.72)

1464 (1.75)

10.76

0.001

 No

71,921 (98.22)

3311 (97.28)

68,610 (98.25)

  

Mode of delivery

 Cesarean

27,096 (36.77)

1838 (54.67)

25,258 (36.14)

332.93

< 0.001

 Vaginal

46,073 (63.23)

1574 (45.33)

44,499 (63.86)

  

Infant sex

 Female

34,170 (47.30)

1636 (47.97)

32,534 (47.27)

0.45

0.504

 Male

39,323 (52.70)

1780 (52.03)

37,543 (52.73)

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