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Table 2 Degree of bivariate overlap in exposure to the various metals and welding fumes in INTEROCC, in glioma cases and controls combined, 2000-2004a

From: Lifetime occupational exposure to metals and welding fumes, and risk of glioma: a 7-country population-based case–control study

  Cadmium Chromium Iron Lead Nickel Welding fumes
n 130 537 772 546 659 570
Cadmium - 7.1 6.6 10.4 7.4 2.6
Chromium 29.2 - 69.6 40.3 79.8 66.0
Iron 39.2 100 - 64.1 95.6 100
Lead 43.8 41.0 45.3 - 44.5 53.0
Nickel 37.7 98.0 81.6 53.7 - 82.8
Welding fumes 11.5 70.0 73.8 55.3 71.6 -
  1. aValues of cells in each column represent the proportion of participants with exposure to the agent in the column heading who were also exposed to the agent in the corresponding row. For welding fumes, exposures to other metals could come from welding activities, from other activities in the same job and/or from activities in other jobs