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Table 2 Crude and adjusted odds ratios of spontaneous abortion by risk factors of female workers employed in the semiconductor industry

From: The relationship between spontaneous abortion and female workers in the semiconductor industry

 

Pregnancy

SA

Crude

Adjusted

 

Model 1a

Model 2b

Model 3c

 

(N = 4037)

(N = 529)

OR

(95% CI)

OR

(95% CI)

OR

(95% CI)

OR

(95% CI)

The job held longest

 FAB

2314

291 (12.6)

1.15

0.81–1.64

1.09

0.71–1.67

1.08

0.70–1.66

1.08

0.64–1.81

 PKG

1372

199 (14.5)

1.36

0.94–1.96

1.28

0.82–1.99

1.26

0.81–1.97

1.24

0.72–2.12

 Clerical worker

351

39 (11.1)

1.0

 

1.0

 

1.0

 

1.0

 

Age at conception (years)

 ≤29

2965

354 (11.9)

1.0

 

1.0

 

1.0

 

1.0

 

 30–34

951

141 (14.8)

1.28

1.04–1.58

1.35

1.08–1.69

1.34

1.06–1.70

1.34

1.01–1.78

 ≥35

121

34 (28.1)

2.88

1.91–4.35

2.98

1.94–4.59

2.93

1.88–4.55

2.95

1.79–4.85

BMI at interview (kg/m2)

 ≤24.9

3335

421 (12.6)

1.0

 

1.0

 

1.0

 

1.0

 

 ≥25.0

702

108 (15.4)

1.26

1.00–1.58

1.16

0.91–1.48

1.15

0.90–1.48

1.16

0.91–1.48

Level of education at interview

 High school

1435

185 (12.9)

1.0

 

1.0

 

1.0

 

1.0

 

 College/university

2602

344 (13.2)

1.03

0.85–1.25

1.04

0.84–1.29

1.03

0.84–1.28

1.08

0.87–1.34

Smoking status at interview

 Non smoker

3298

410 (12.4)

1.0

 

1.0

 

1.0

 

1.0

 

 Smoker

739

119 (16.1)

1.35

1.08–1.69

1.44

1.14–1.81

1.42

1.13–1.80

1.37

1.08–1.73

Pregnancy outcome prior to pregnancy

 Primigravida

2156

267 (12.4)

1.0

   

1.0

 

1.0

 

 Full term delivery

1334

166 (12.4)

1.01

0.82–1.24

  

0.95

0.76–1.20

0.92

0.73–1.16

 Preterm delivery

57

6 (10.5)

0.83

0.35–1.96

  

0.87

0.36–2.09

0.84

0.35–2.01

 Spontaneous abortion

361

69 (19.1)

1.67

1.25–2.24

  

1.58

1.16–2.15

1.53

1.12–2.08

 Induced abortion

103

15 (14.6)

1.21

0.69–2.12

  

0.79

0.40–1.56

0.81

0.41–1.59

 Stillbirth

26

6 (23.1)

2.12

0.84–5.33

  

1.63

0.59–4.49

1.70

0.62–4.70

Duration of employment at conception (years)

 ≤4

872

93 (10.7)

1.0

     

1.0

 

 5–9

1962

268 (13.7)

1.33

1.03–1.70

    

1.26

0.97–1.65

 ≥10

1203

168 (14.0)

1.36

1.04–1.78

    

1.08

0.76–1.52

Year of conception

 ≥2009

2545

372 (14.6)

1.0

     

1.0

 

 ≤2008

1492

157 (10.5)

0.69

0.56–0.84

    

0.80

0.64–1.00

Study plant

 A plant

2383

313 (13.1)

1.0

     

1.0

 

 B plant

1654

216 (13.1)

0.99

0.82–1.20

    

1.01

0.82–1.23

Work schedule

 Days only

659

82 (12.4)

1.0

     

1.0

 

 Rotating shift

3378

447 (13.2)

1.07

0.83–1.38

    

0.97

0.69–1.38

  1. FAB fabrication process worker, PKG package process worker
  2. Smokers included current and former smokers
  3. SA spontaneous abortion, OR odds ratio, CI confidence interval
  4. Values displaying significant differences are shown in bold (p-value ≤ 0.05)
  5. aMultiple logistic regression model adjusted for the job held longest, age, BMI, education, smoking
  6. bMultiple logistic regression model adjusted for the job held longest, age, BMI, education, smoking, pregnancy outcome just prior to pregnancy
  7. cMultiple logistic regression model adjusted for the job held longest, age, BMI, education, smoking, pregnancy outcome prior to pregnancy, duration of employment, year of conception, study plant, shift work
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Annals of Occupational and Environmental Medicine

ISSN: 2052-4374

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