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1.
Figure 2

Figure 2. From: Mortality From Lymphohematopoietic Malignancies Among Workers in Formaldehyde Industries: The National Cancer Institute Cohort.

Association between average intensity of formaldehyde exposure and the risk of lymphohematopoietic malignancy. Relative risks for medium (0.5–<1.0 ppm) and high (≥1.0 ppm) average-intensity formaldehyde exposure categories compared with the low exposed category (>0–<0.5 ppm) for lymphohematopoietic malignancies by year of end of follow-up, 1965–2004. Values plotted at 0.1 represent RR = 0 due to no cases in the exposure category. The small graphs above the relative risk plots represent the exposure–response trend P values based on two-sided likelihood ratio tests (1 df) of zero slope for continuous formaldehyde exposure among exposed person-years only. The points represent the relative risk estimates based on the cumulative number of cases and person-years accrued from the start of the study to that point in time and for 2004 are equivalent to the relative risk estimates presented in Table 3. HLP = lymphohematopoietic malignancies, NHL = non-Hodgkin lymphoma, HDG = Hodgkin lymphoma, MM = multiple myeloma, LEU = leukemia, LYL = lymphatic leukemia, MYL = myeloid leukemia; RR = relative risk.

Laura E. Beane Freeman, et al. J Natl Cancer Inst. 2009 May 20;101(10):751-761.
2.
Figure 1

Figure 1. From: Mortality From Lymphohematopoietic Malignancies Among Workers in Formaldehyde Industries: The National Cancer Institute Cohort.

Association between peak formaldehyde exposure and the risk of lymphohematopoietic malignancy. Relative risks for medium-peak (2.0 to <4.0 ppm) and high-peak (≥4.0 ppm) formaldehyde exposure categories compared with the low exposed category (>0 to <2.0 ppm) for lymphohematopoietic malignancies are shown by year of end of follow-up, 1965–2004. Values plotted at 0.1 represent RR = 0 due to no cases in the exposure category; values plotted at 20 represent RR = infinity due to no cases in the referent category. The small graphs above the relative risk plots represent the exposure–response trend P values based on two-sided likelihood ratio tests (1 df) of zero slope for continuous formaldehyde exposure among exposed person-years only. The points represent the relative risk estimates based on the cumulative number of cases and person-years accrued from the start of the study to that point in time and for 2004 are equivalent to the relative risk estimates presented in Table 2. HLP = lymphohematopoietic malignancies, NHL = non-Hodgkin lymphoma, HDG = Hodgkin lymphoma, MM = multiple myeloma, LEU = leukemia, LYL = lymphatic leukemia, MYL = myeloid leukemia; RR = relative risk.

Laura E. Beane Freeman, et al. J Natl Cancer Inst. 2009 May 20;101(10):751-761.

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