This retrospective case-control study of 56 cases and 56 controls measured extra low frequency (ELF) electric and magnetic fields between 2000 h and 0800 h in the bedplaces of children with leukaemia.
Mean ELF electric field (E-field) levels found in case homes of 13.9 Vm-1 (SD : 13.6) were significantly higher (P<0.01) compared with only 7.3 Vm-1 (SD : 12.9) in controls matched for age and sex.
Moreover, applying conditional logistic regression, a dose-response relationship emerged between E-field exposure and incidence : above 20 Vm-1 the relative risk was 4.69 (95% CI : 1.17-27.78 ; P=0.025), whereas at levels of 10-19 Vm-1 it was 2.40 (95% CI : 0.79-8.09) and at levels of 5-9 Vm-1 it was only 1.46 (95% CI : 0.47-5.10).
By contrast, similar readings of the rms ELF magnetic field found no significant case-control differences : mean levels in cases'homes of 0.070 muT (SD : 0.070) compared with 0.057 muT (SD : 0.038) in controls.
Although there were imperfections in the study design, it is concluded that the importance of the E-field may have been overlooked in epidemiological studies to date.
Mots-clés Pascal : Basse fréquence, Champ électromagnétique, Facteur risque, Leucémie, Enfant, Homme, Champ électrique, A domicile, Epidémiologie, Hémopathie maligne, Etude cas témoin
Mots-clés Pascal anglais : Low frequency, Electromagnetic field, Risk factor, Leukemia, Child, Human, Electric field, At home, Epidemiology, Malignant hemopathy
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0336727
Code Inist : 002B19B. Création : 10/04/1997.