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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