# Anxiety in Healthy Subjects Participating in 7T Examinations--Longitudinal Study
## 4 Results  
The 42 participants, 26 females and 16 males with a mean age = 27 (range 20-41), answered questions regarding experiences in conjunction with 7T MRI examinations. A total of 29 of the 42 participants had not had a previous MRI examination. Eleven of the questions were compared between after the first examination and after the second examination on the same day in a paired \(t\)-test (Table 1). To the question of whether they felt worried before the MR examination, significantly more people answered that they were worried before the first examination than the second examination (M = 0.357, SD = 0.533, \(p\) < 0,001). To the question of whether they felt tense after the examination, significantly more people answered that they did after the first examination than the second examination (M = 0.167, SD = 0.537, \(p\) = 0.03).  
Significantly more people felt that they were better informed before the second examination than the first examination (M = \(-\)0.095, SD = 0.370, \(p\) = 0.05). However, significantly more people reported feeling fine overall after the first examination than after the second (M = 0.095, SD = 0.370, \(p\) = 0.05). All questions and significance are presented in Table 1. The questions with significant differences in the answers are also shown in bar charts (Figure 1). When the test was conducted on participants who had not previously undergone an MRI examination (\(n\) = 29), only the first question--whether they felt worried before the MRI examination--showed a significant difference between the first and second MR examinations.  
Figure 1: _Cont_.  
\begin{table}
\begin{tabular}{l c c c c} \hline \hline \multirow{2}{*}{**Question**} & \multicolumn{4}{c}{**\(t\)-Test**} \\ \cline{2-5}  & **Mean** & **SD** & **\(t\)(d1)** & \(p\)** \\ \hline
**Did you feel worried before the MR examination?** & 0.357 & 0.533 & 4.343 & **\textless{}0.001** \\ Did you feel well nested before the MR examination & \(-\)0.095 & 0.484 & \(-\)1.274 & 0.105 \\ Do you feel calm after the examination? & \(-\)0.095 & 0.617 & \(-\)1.000 & 0.162 \\ Do you feel tired after the examination? & \(-\)0.071 & 0.745 & \(-\)0.621 & 0.269 \\
**Do you feel tense after the examination?** & 0.167 & 0.537 & 2.011 & **0.025** \\ Do you feel upset after the examination? & 0.024 & 0.154 & 1.000 & 0.162 \\
**Would you say that you are overall feeling fine after the MR examination?** & 0.095 & 0.370 & 1.667 & **0.052 \({}^{*}\)** \\ Are you satisfied with how the MR examination went? & \(-\)0.071 & 0.463 & \(-\)1.000 & 0.162 \\ Did you feel that you had good contact between the staff and you during the examination? & 0.095 & 0.431 & 1.432 & 0.080 \\ Do you feel safe in the MR/hospital-environment? & 0.071 & 0.342 & 1.355 & 0.091 \\
**Did you feel well informed before the MR examination?** & \(-\)0.095 & 0.370 & \(-\)1.667 & **0.052 \({}^{*}\)** \\ \hline \hline \end{tabular}  
\({}^{*}\) Borderline significant.  
\end{table}
Table 1: Paired \(t\)-test with one-sided significance for detecting differences between first and second MRI examination. Questions in **bold** have a significant difference between the two MRI examinations.  
Six people (14%) answered that they felt nervous about the second MRI examination after the first one was finished (Figure 2). [PERSON]'s rank correlation revealed no significant relationship (\(p=0.07\)) between dizziness experienced when entering the magnet and nervousness before the second MRI examination.  
The bar chart in Figure 3 shows that the feeling of anxiety before the examination was unnecessary in retrospect.  
Figure 1: Bar chart of the four questions that showed a significant difference in experience between the two MRI examinations.