100 healthy volunteers (69 women and 31 men) aged 18-30 years with no clinical evidence of hearing disorder were divided into the following groups depending upon their GSM mobile phone usage: 1) subjects using mobile phones for 1 to 5 years for <60 minutes/day (n=24), 2) subjects using mobile phones for 1 to 5 years for >60 minutes/day (n=16), 3) subjects using mobile phones for >5 years for <60 minutes/day (n=10), 4) subjects using mobile phones for >5 years for >60 minutes/day (n=17), 5) subjects who had never used any mobile phone (control group, n=33).
(remark EMF-Portal: the actual use of the mobile phone (i.e. calling, text messages, internet use) was not discriminated and it is not stated how the exposure was determined (e.g. via questionnaire)).
No significant differences were found between mobile phone user groups and the control group.
The authors conclude that there is no evidence for effects of long-term GSM mobile phone usage on acoustic evoked brainstem potentials.