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Table 1 Baseline characteristics of study participants according to spontaneous abortion among 4078 of Korean workers aged more than 19 years

From: Spontaneous and repeat spontaneous abortion risk in relation to occupational characteristics among working Korean women: a cross-sectional analysis of nationally representative data from Korea

 

Spontaneous abortion

No, (n, %)

Yes, (n, %)

χ2

P-value

Total subjects

3844

94.3

234

5.7

  

Age at survey participation

    

14.62

0.0001

 19–40

1341

96.8

44

3.2

  

 41–60

1783

92.7

141

7.3

  

  ≥ 60

720

93.6

49

6.4

  

Education

    

25.61

<.0001

 Middle school

1406

92.7

110

7.3

  

 High school

1222

93.1

91

6.9

  

 College or more

1216

97.4

33

2.6

  

Household income

    

0.06

0.8021

 1st Quartile

524

93.4

37

6.6

  

 2nd Quartile

958

94.6

54

5.3

  

 3rd Quartile

1143

94.5

67

5.5

  

 4th Quartile

1219

94.1

76

5.9

  

Smoking

    

0.15

0.6946

 None

3431

94.2

211

5.8

  

 Past

183

94.8

10

5.2

  

 Current

230

94.7

13

5.4

  

Drinking

    

0.13

0.7124

 None

1125

94.3

68

5.7

  

 Standard

2529

94.1

158

5.9

  

 Severe

190

96.0

8

4.0

  

Body weight

    

6.15

0.0131

 Under weight

236

96.7

8

3.3

  

 Normal

2536

94.6

146

5.4

  

 Overweight

916

93.2

67

6.8

  

 Obesity

156

92.3

13

7.7

  

Occupational classification

    

19.35

<.0001

 White-collared

1350

96.8

44

3.2

  

 Pink/Green-collared

1632

92.9

124

7.1

  

 Blue-collared

862

92.9

66

7.1

  

Work schedule

    

0.94

0.3317

 Fixed

3230

94.4

191

5.6

  

 Shift

614

93.5

43

6.5

  

Weekly working hours

    

9.08

<.0001

  ≤ 50

2823

95.1

145

4.9

  

 51–60

532

93.3

38

6.7

  

 61–70

250

90.9

25

9.1

  

  > 70

239

90.2

26

9.8