42 adults (76% women) participated in the study. Subjects were eligible if they reported to sense one of the available experimental EMF signals (GSM 900, GSM 1800, DECT, UMTS and WiFi) or extremely low-frequencymagnetic fields (50 Hz sine signal or four different types of signals with other frequency components added, so called dirty electricity) within minutes of being exposed, or developing acute and transienthealth complaints. Each participant was sent a questionnaire after inclusion in the study. Then they were visited at home or another location where they felt comfortable, filled in a further questionnaire and an un-blindedexposuresession was applied to determine the type of signal, signal strength and exposure duration that participants reported sensing or reacting to. This was followed by a double-blind trial of 10-20 exposure or sham exposure conditions in randomized sequence. Directly after each condition, participants specified on a form whether they thought exposure had been applied or not. After testing, participants again filled in a questionnaire and then the test results were communicated to the participants, i.e. the percentage of correct field on/off answers. 2 and 4 months after participation, they were sent a follow-upquestionnaire.
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