Grayson JK
Grayson studied male members of the US Air Force who had completed at least one full year of service between January 1, 1970 and December 31, 1989. From this population, 230 men with brain tumours were compared with 920 controls. Each case had four controls, matched on year of birth and race. Exposure to electromagnetic fields was estimated from occupational history. Only crude estimates of individual exposure could be made. Radiofrequency/microwave exposure was associated with a risk of 1.39. Officers were more likely than enlisted men to develop brain tumours. There was no clear potential exposure-response pattern.

It was hypothesised that military rank was an indicator of socio-economic status, but it was not clear what factor or factors associated with this could have influenced the outcome.

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