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From a total of 251 healthy volunteers recruited from the hospital staff, 148 subjects (85 women and 63 men) were included in the study. The inclusion criteria were age >18 years, an interference-free 24-h ECG and the volunteer's consent. Subjects were divided into 4 groups according to the duration of mobile phone use: 1) < 30 minutes/day (n=37), 2) 30 - 60 minutes/day (n=37), 3) > 60 minutes/day (n=39), 4) no mobile phone use (control group; n=35). All participants (except for the control group) had been using mobile phones for > 10 years prior to the study.
daily durations of mobile phone use were calculated automatically by dividing the total duration of calls (total minutes within a month) into the number of telephone calls (total number within a month)