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Table 6 Meta-analysis of formaldehyde exposure and nasopharyngeal cancer

From: Does formaldehyde have a causal association with nasopharyngeal cancer and leukaemia?

Authors, (Years)

Studies

Overall OR or RR (95% CI)

Collins et al.,(1997) [36]

Cohort studies with reported expected deaths

Industrial cohort studies

Case-control studies

All Studies

1.6 (0.8–3.0)

1.2 (0.4–2.5)

1.3 (0.9–2.1)

1.3 (1.2–1.5)

Bosetti et al. (2008) [37]

Hauptmann et al. 2004-plant 1

Hauptmann et al. 2004-plants 2–10

Industrial cohort studies

9.10 (4.09–20.26)

0.64 (0.16–2.56)

1.33 (0.69–2.56)

Bachand et al. (2010) [38]

Cohort studies (excluding single plant)

Case control studies

0.72 (0.40–1.29)

1.22 (1.00–1.50)