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Table 2 Distribution of pharyngeal cancer cases in the NCI-cohort by sub-localization and study site (1934–2004)

From: New insights into the mortality risk from nasopharyngeal cancer in the national cancer institute formaldehyde worker cohort study

ICD8

Study site

Obs

Exp

SMR

95% CI

147 (NPC)

Wallingford

6

1.08

5.57

2.04–12.1

146,148,149

Wallingford

11

6.58

1.67

0.83–2.99

146–149

Wallingford

17

7.66

2.22

1.29–3.55

147 (NPC)

All other plants

5

4.70

1.06

0.35–2.48

146,148,149

All other plants

28

29.09

0.96

0.64–1.39

146–149

All other plants

33

33.79

0.98

0.67–1.37

147 (NPC)

Total

11

5.78

1.90

0.95–3.40

146,148,149

Total

39

35.67

1.09

0.78–1.49

146–149

Total

50

41.46

1.21

0.90–1.59

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Journal of Occupational Medicine and Toxicology

ISSN: 1745-6673