Publication of results from the Northern California Childhood Leukemia Study
EMF results have been published from the Northern California Childhood Leukemia Study. This is a larger study that has been used to look at both magnetic fields and contact currents. It finds no association with leukaemia for either measure. But looking at the totality of all the studies published on childhood leukaemia, there is still an association with magnetic fields.
|Radiat Res. 2010 Dec 8. [Epub ahead of print]Exposure to Electrical Contact Currents and the Risk of Childhood Leukemia.
Does M, Scélo G, Metayer C, Selvin S, Kavet R, Buffler P.a School of Public Health, University of California, Berkeley, Berkeley, California.
Abstract The objectives of this study were to examine the association between contact current exposure and the risk of childhood leukemia and to investigate the relationship between residential contact currents and magnetic fields. Indoor and outdoor contact voltage and magnetic-field measurements were collected for the diagnosis residence of 245 cases and 269 controls recruited in the Northern California Childhood Leukemia Study (2000-2007). Logistic regression techniques produced odds ratios (OR) adjusted for age, sex, Hispanic ethnicity, mother’s race and household income. No statistically significant associations were seen between childhood leukemia and indoor contact voltage level [exposure ≥90th percentile (10.5 mV): OR = 0.83, 95% confidence interval (CI): 0.45, 1.54], outdoor contact voltage level [exposure ≥90th percentile (291.2 mV): OR = 0.89, 95% CI: 0.48, 1.63], or indoor magnetic-field levels (>0.20 µT: OR = 0.76, 95% CI: 0.30, 1.93). Contact voltage was weakly correlated with magnetic field; correlation coefficients were r = 0.10 (P = 0.02) for indoor contact voltage and r = 0.15 (P = 0.001) for outdoor contact voltage. In conclusion, in this California population, there was no evidence of an association between childhood leukemia and exposure to contact currents or magnetic fields and a weak correlation between measures of contact current and magnetic fields.