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Table 3 Comparison of observed to expected (O/E) numbers of cases and standardized incidence ratios (SIR) with 95% confidence interval (CI) for 4 different types of cancer amongst female workers, by calendar years and duration of employment

From: Increased standardized incidence ratio of breast cancer in female electronics workers

  Breast cancer Cervical cancer Colorectal cancer Thyroid cancer
Duration of Employment O/E SIR (95% CI) O/E SIR (95% CI) O/E SIR (95% CI) O/E SIR (95% CI)
Overall         
< 1 month 56/43.8 1.28 (0.97–1.66) 66/59.2 1.11 (0.86–1.42) 18/15.5 1.16 (0.69–1.84) 11/15.2 0.73 (0.36–1.30)
1–11 months 84/84.9 0.99 (0.79–1.22) 132/114.9 1.15 (0.96–1.36) 36/27.7 1.30 (0.91–1.80) 22/25.7 0.86 (0.54–1.30)
1–4 years 71/64.8 1.10 (0.86–1.38) 68/90.2 0.75 (0.59–0.96) 18/17.8 1.01 (0.60–1.60) 11/15.3 0.72 (0.36–1.29)
5–9 years 47/53.3 0.88 (0.65–1.17) 60/68.9 0.87 (0.66–1.12) 11/13.2 0.84 (0.42–1.50) 7/8.6 0.82 (0.33–1.69)
≥ 10 years 28/16.7 1.68 (1.11–2.42) 11/19.3 0.57 (0.28–1.02) 15/15.3 0.98 (0.55–1.62) 8/13.2 0.61 (0.26–1.20)
Total 286/263.6 1.09 (0.96–1.22) 337/352.4 0.96 (0.86–1.06) 98/89.3 1.10 (0.89–1.34) 59/77.9 0.76 (0.58–0.98)
Before 20 June 1974         
< 1 month 11/5.6 1.97 (0.98–3.52) 5/7.4 0.68 (0.22–1.58) 1/1.8 0.57 (0.01–3.15) 0/1.1 -
1–11 months 19/15.6 1.22 (0.73–1.90) 26/20.8 1.25 (0.82–1.83) 5/4.9 1.02 (0.33–2.39) 2/2.9 0.68 (0.08–2.47)
1–4 years 17/12.3 1.38 (0.81–2.22) 16/17.3 0.93 (0.53–1.50) 2/3.6 0.56 (0.06–2.02) 2/1.9 1.03 (0.12–3.71)
5–9 years 20/17.5 1.14 (0.70–1.76) 14/23.3 0.60 (0.33–1.01) 7/4.0 1.73 (0.69–3.57) 0/2.7 -
≥ 10 years 23/14.2 1.62 (1.02–2.42) 11/16.5 0.67 (0.33–1.19) 6/6.3 0.96 (0.35–2.08) 1/3.6 0.28 (0.004–1.54)
Total 90/65.2 1.38 (1.11–1.70) 72/85.2 0.84 (0.66–1.06) 21/20.5 1.02 (0.63–1.56) 5/12.2 0.41 (0.13–0.95)
After 20 June 1974         
< 1 month 45/38.2 1.18 (0.86–1.57) 61/51.8 1.18 (0.90–1.51) 17/13.7 1.24 (0.72–1.99) 11/14.1 0.78 (0.39–1.39)
1–11 months 65/69.3 0.94 (0.72–1.20) 106/94.1 1.13 (0.92–1.36) 31/22.8 1.36 (0.92–1.93) 20/22.8 0.88 (0.54–1.36)
1–4 years 54/52.5 1.03 (0.77–1.34) 52/72.9 0.71 (0.53–0.94) 16/14.2 1.13 (0.64–1.83) 9/13.3 0.68 (0.31–1.28)
5–9 years 27/35.8 0.75 (0.50–1.10) 46/45.7 1.01 (0.74–1.34) 4/9.1 0.44 (0.12–1.12) 7/5.9 1.20 (0.48–2.46)
≥ 10 years 5/2.5 2.03 (0.65–4.74) 0/2.8 - 9/9.0 1.00 (0.46–1.90) 7/9.6 0.73 (0.29–1.51)
Total 196/198.3 0.99 (0.85–1.14) 265/267.2 0.99 (0.88–1.12) 77/68.8 1.12 (0.88–1.40) 54/65.6 0.82 (0.62–1.07)
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