Table 9.

Meta-analysis of formaldehyde exposure and lymphohemtopoietic malignancies

Authors, (Years)	Studies	Overall OR or RR (95% CI)
Collins et al. (2004) [53]	All studies for for leukemia Industrial workers Embalmers Pathologists and anatomist	1.1 (1.0–1.2) 0.9 (0.8–1.0) 1.6 (1.2–2.0) 1.4 (1.0–1.4)
Bosetti et al. (2008) [37]	All LHM
	Industrial workers	0.85 (0.74–0.96)
	Professionals	1.31 (1.16–1.48)
	Leukemia
	Industrial workers	0.90 (0.75–1.07)
	Professionals	1.39 (1.15–1.68)
Zhang et al. (2009) [54]	All LHM All leukemia Myeloid leukemia Hodgkin lymphoma Non-Hodgkin lymphoma Multiple myeloma	1.25 (1.12–1.39) 1.54 (1.18–2.00) 1.90 (1.31–2.76) 1.23 (0.67–2.29) 1.08 (0.86–1.35) 1.31 (1.02–1.67)
Bachand et al. (2010) [38]	All leukemia Professional/technical workers Industrial workers Myeloid leukemia Lymphoid leukemia	1.05 (0.93–1.20) 1.28 (0.98–1.66) 0.99 (0.86–1.15) 1.09 (0.84–1.40) 1.11 (0.81–1.52)
Schwik et al. (2010) [55]	All leukemia Professional workers Industry workers Healthy-worker effect adjusted Myeloid leukemia Healthy-worker effect adjusted	1.53 (1.11–2.21) 2.27 (1.15–4.45) 1.38 (0.96–1.99) 1.72 (1.18–2.51) 2.47 (1.42–4.27) 2.77 (1.39–5.52)

LHM, Lymphohematopoietic malignancies