## 4 Discussion  
The presented study demonstrates that risk perception should not only be differentiated according to the level and range of concerns, but also in terms of the endurance of these concerns. It should not only be distinguished between people with high and low levels of concern, but also between those with enduring concerns and concerns that are only expressed in a survey situation. Survey methodologists (see [PERSON] (1966)) have already underlined that the questionnaire--particularly the question wording and question format--can strongly influence the obtained findings. This could be also a problem for risk perception research. If taken seriously, it threatens the validity of conventional risk perception surveys, e.g., the Eurobarometer survey on EMF risk perception ([PERSON] et al., 2016). In line with this thinking, the present study focused especially on the distinction between not enduringly concerned and enduringly concerned people. Both groups expressed high risk perception in the survey, but only the latter reported that RF EMF risk was a topic which they thought about in their daily life. Enduringly concerned people showed a number of unique features: they believed that they are highly exposed to RF EMFs and revealed a more negative anthropocentric view, being convinced that man-made EMFs are more dangerous than natural EMFs. Of course, full exploration of how this effect occurs will require further consideration of the knowledge-base on which these questions are answered. This applies in particular to the distinction between natural and man-made RF EMF. A preliminary explanation could be given by [PERSON]'s [PERSON] (2010) suggestion that nature implies safety for most people. In addition, they also displayed a less elaborated concept of how RF EMF exposure impacts health: enduringly concerned people were more convinced that even a very low RF EMF exposure can have detrimental health effects when they were asked directly by a closed question. Even if enduringly concerned subjects are sensitive to exposure reduction, this group does not appear to comply with the basic principle that \"the dose makes the poison\", which dates back to [PERSON]. In addition, this group has a stronger dogmatic view on base stations being perceived as'scary' objects, no matter whether the person is exposed to RF EMF from this source or not. Compared to the other groups, the enduringly concerned respondents also considered the location of base stations as more of a political issue, that furthermore should take into account the views of residents who might be affected by the location. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Exposure Reduction** & **RP Groups** & **RP Groups** & \
\begin{tabular}{c} **Mean Difference** \\ **Distance (M)** \\ \end{tabular} &
\begin{tabular}{c} \(P\) \\ \end{tabular} \\ \hline \multirow{4}{*}{30\%} & n/l con & not end con & 684 & \textless{}0.001 \\  & & end con & 1174 & \textless{}0.001 \\ \cline{2-5}  & not end con & n/l con & 684 & \textless{}0.001 \\  & end con & 490 & 0.072 \\ \cline{2-5}  & end con & n/l con & 1174 & \textless{}0.001 \\  & not end con & 490 & 0.072 \\ \hline \multirow{4}{*}{50\%} & n/l con & not end con & 559 & \textless{}0.001 \\  & not end con & end con & 976 & \textless{}0.001 \\  & not end con & 427 & 0.080 \\ \cline{2-5}  & end con & n/l con & 976 & \textless{}0.001 \\  & end con & not end con & 427 & 0.080 \\ \hline \multirow{4}{*}{70\%} & n/l con & not end con & 429 & \textless{}0.001 \\  & end con & 853 & \textless{}0.001 \\  & not end con & 853 & \textless{}0.001 \\ \cline{2-5}  & not end con & n/l con & 429 & \textless{}0.001 \\  & end con & 424 & 0.060 \\ \cline{2-5}  & end con & n/l con & 853 & \textless{}0.001 \\  & not end con & 424 & 0.060 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: _Cont._The in-depth analysis of RF EMF risk perception revealed that the group of enduringly concerned subjects differed from the other groups regarding how their risk perception was linked to feelings, moral aspects, and perceived exposure.