metrices

First, years since first mobile phone use were preferred to the number of years of mobile phone use to estimate exposure in most of the cancer-related mobile phone studies, too, and, if both metrices were used, the results differed only marginally (e.g. [4] - [7]); an effect most likely attributable to the habit that the amount of mobile phone use varies over time but persons who once started using mobile phones rarely completely stop using them.

PLoS ONE Alerts: New Articles 2009