Table 13a.

Association between formaldehyde and multiple myeloma (ICD 203).

	Beane Freeman et al., 2009
	NCI cohort (1934-2004)
Measures	Category	Obs	Estimate		95% CI
Unexposed/eEposed	Unexposed	11	SMR	1.78	0.99–3.22
	Exposed	48	SMR	0.94	0.71–1.25
Peak Exposure	0 ppm	11	RR	2.74	1.18–6.37
	>0–<2.0 ppm	14	RR	1.00	—
	2.0–<4.0 ppm	13	RR	1.65	0.76–3.61
	≥4.0 ppm	21	RR	2.04	1.01.4.12
	ptrend = .08 (exposed)
	ptrend > .5 (exposed and unexposed)
Average Intensity	0 ppm	11	RR	2.18	1.01–4.70
	>0–<0.5 ppm 25 RR 1.00 —
	0.5–<1.0 ppm	11	RR	1.40	0.68–2.86
	>1.0 ppm	12	RR	1.49	0.73.3.04
	ptrend > .5 (exposed)
	ptrend > .5 (exposed and unexposed)
Cumulative Exposure	0 ppm-yr	11	RR	1.79	0.83–3.89
	>0–<1.5 ppm-yr	28	RR	1.00	—
	>1.5–<5.5 ppm-yr	5	RR	0.46	0.18–1.20
	≥5.5 ppm-yr	15	RR	1.28	0.67.2.44
	ptrend > .5 (exposed)
	ptrend > .5 (exposed and unexposed)
Cumulative number of peaks ≥4.0 ppm	No association. Results not shown.
Duration of Employment	No association. Results not shown.