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Occup Environ Med 57:249-257 doi:10.1136/oem.57.4.249
  • Paper

Non-Hodgkin's lymphoma among electric utility workers in Ontario: the evaluation of alternate indices of exposure to 60 Hz electric and magnetic fields

Table 9

Non-Hodgkin's lymphoma standardised coefficients (SCs)11-150 obtained from the conditional logistic model containing terms for duration of employment, time (%) spent above electric field threshold and arithmetic mean field exposure

Exposure index11-151 Lower bound of electric field threshold
5 V/m 10 V/m 20 V/m 39 V/m 156 V/m
SC p Value11-152 SC p Value SC p Value SC p Value SC p Value
Arithmetic mean (magnetic field) −0.62 0.53 −0.65 0.52 −0.48 0.63 −0.53 0.60 −0.43 0.67
Arithmetic mean (electric field) 0.42 0.68 −0.04 0.97 −0.18 0.86 −0.30 0.77 −0.83 0.41
Duration of employment 0.12 0.91 0.33 0.74 0.46 0.64 0.09 0.76 0.211 0.83
Time (%) spent above electric field threshold 1.49 0.14 2.04 0.04 2.28 0.02 1.57 0.12 1.63 0.10

  • ↵11-150 SCs were obtained by dividing the regression coefficient by its SE and were adjusted by socioeconomic status, and exposure to benzene and 2,4,5-T.

  • ↵11-151 Exposure indices were modelled simultaneously.

  • ↵11-152 p Value based on the Wald χ2 test statistic.

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