Characteristics of the study participants of the longitudinal study at follow-up (baseline data are presented in Mohler et al. 2010 [24]) and of the participants of the nested sleep study.

a)Data may not sum up to 100% due to missing data.b)Answering yes to either “Are you electro hypersensitive?” or “Do you think that you develop detrimental health symptoms due to electromagnetic pollution in everyday life?”