Reference

Study Population

Exposed Cases

Estimated Relative Risk (95% CI)

Blair et al., 1998

Aircraft-maintenance workers in Utah

 

 

Any exposure (males and females)

14

1.3 (0.5–3.4)

 

Males

 

 

Low level intermittent

4

0.5 (0.1–1.9)

 

Low level continuous

4

0.8 (0.2–3.2)

 

Frequent peaks

4

0.8 (0.2–3.3)

 

Females

 

 

Low level intermittent

4

4.4 (1.0–20.4)

 

Low level continuous

1

2.4 (0.2–24.3)

 

Frequent peaks

1

0.9 (0.1–8.9)

 

Cumulative exposure, males (mortality)

 

 

No exposure

10

1.7 (0.5–5.5)

 

<5 unit-years

4

1.0 (0.2–4.2)

 

5–25 unit-years

2

0.8 (0.1–4.4)

 

>25 unit-years

4

1.2 (0.3–4.7)

 

Cumulative exposure, females (mortality)

 

 

No exposure

11

1.0 (0.1–9.9)

 

<5 unit-years

2

3.2 (0.5–19.8)

 

5–25 unit-years

1

4.3 (0.4–43.4)

 

≥25 unit-years

1

1.3 (0.1–13.2)

Axelson et al., 1994

Male workers in Sweden, ever exposed

1

0.57 (0.01–3.17)

Benzene

Cohort Studies—Mortality

Ireland et al., 1997

Male US chemical-plant workers

 

 

Production workers

 

 

Nonexposed

1

0.5 (0.0–2.8)

 

Any exposure

3

3.2 (0.7–9.4)

 

<12ppm-month

0

0.0 (0.0–10.1)

 

12–72 ppm-month

2

6.8 (0.8–2.5)

 

>72 ppm-month

1

3.7 (0.1–20.1)

Schnatter et al., 1996a

Male Canadian petroleum-distribution workers

 

 

0.00–0.49 ppm-years

3

1.00

 

0.50–7.99 ppm-years

1

0.39 (0.01–5.16)

 

8.00–1 9.99 ppm-years

1

0.60 (0.01–7.83)

 

20–219.8 ppm-years

2

1.22 (0.07–20.0)

Yin et al., 1996a,b

Chinese factory workers, ever exposed

1

0.4 (0.0–10.7)

Wong, 1995

Male US Pliofilm workers in Ohio (through 1987)

4

2.91 (0.79–7.45)

 

<40 ppm-years

3

3.21 (0.66–9.39)

 

40–200 ppm-years

0

0 (0–12.29)

 

200–400 ppm-years

0

0 (0–36.89)

 

>400 ppm-years

1

25.17 (0.63–139.83)

Rinsky et al., 1987

Male US Pliofilm workers in Ohio (through 1981)

4

4.09 (1.10–10.47)

 

<40 ppm-years

3

4.58 (0.92–13.39)

 

40–200 ppm-years

0

0

 

200–400 ppm-years

0

0

 

>400 ppm-years

1

53.47 (0.70–297.53)



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