Table 1 Selected characteristics and findings for 10 plants in 2004 update of NCI formaldehyde cohort study

Entry year

1943

1945

1949

1958

1957

1951

1938

1934

1956

1941

No. Subjects

4261

784

2375

1692

744

5248

4228

1679

1933

2675

Formaldehyde exposure

 % Subjects ever exposed

87.7

99.9

92.7

93.3

64.4

91

81.6

99.3

88.2

95

 % Subjects ever in highest peak category

46.1

91.6

0

72.9

20.4

2

.4

1.1

9.3

69.7

 Median AIE (ppm) ^a

1.023

2.799

.112

.234

.196

.233

.080

.382

.400

.543

  (5–95 %-tile)

.310–1.417

.300–3.927

.010–.222

.100–.596

.029–1.132

.033–.868

.020–.250

.100–2.000

.100–1.615

.216–1.124

 Median Cum (ppm-years) ^a

.9

19.0

.1

2.2

1.9

.7

.1

.6

.3

1.3

  (5–95 %-tile)

.1–17.2

.4–86.5

.01–2.1

.06–11.9

.08–27.5

.01–16.3

.01–3.5

.03–12.0

.03–5.9

.05–16.4

 Median Dur (years) ^a

1.0

11.3

1.1

9.7

16.7

3.6

1.0

1.0

.8

2.3

  (5–95 %-tile)

.1–24.4

.3–30.7

.1–20.3

.4–29.5

1.0–34.4

.1–31.3

.1–28.0

.1–25.0

.09–16.5

.1–29.2

Observed and expected deaths and SMRs for NPC

 Obs

6

1

2

0

0

0

1

0

0

1

 SMR-US (Exp)

5.44** (1.1)

4.32 (.2)

3.01 (.7)

- (.4)

- (.2)

- (1.1)

.93 (1.1)

- (.4)

- (.3)

1.21 (.8)

  (95 % CI)

2–11.85

.11–24.08

.36–10.87

0–9.03

0–18.63

0–3.42

.02–5.18

0–9.39

0–12.79

.03–6.72

 SMR-local (Exp)

5.57** (1.1)

4.03 (.2)

7.60 (.3)

- (.5)

- (.2)

- (1.3)

1.24 (.8)

- (0)

- (.4)

1.01 (1.0)

  (95 % CI)

2.04–12.12

.10–22.48

.92–27.46

0–7.30

0–21.09

0–2.82

.03–6.89

0–90.04

0–10.14

.03–5.63