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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)