# Audio Feedback with the Use of a Smartphone in Sailing Training among Windsurfers
## 3 Results  
The mean age of the study group was 21.4 \(\pm\) 4.3 years with 9.5 \(\pm\) 4.0 years of experience on average. The BMI for the whole group was equal to 20.9 \(\pm\) 1.46 kg/m\({}^{2}\). The detailed information for groups of different sports levels is shown in Table 1.  
Percentages of positive, neutral, and negative answers were presented in Figure 4; answers were accumulated to three categories: positive (strongly agree and agree), neutral, and negative (disagree and strongly disagree). In case of the technical and aesthetic aspects of functions of the application (4A), it was observed that most of the competitors evaluated application function positively (54-85%). The usefulness for windsurfers during upwind sailing races (4B) was assessed positively in Q4, relating to reliability of reflecting the deviation of the board course from the set angle (77%). Scores for the other aspects (Q5-Q8) were lower (46-69% negative answers).  
Statistically significant negative correlation coefficients were noted between competition experience, as well as sports level and scores, for Q6 and Q7 (Table 2). It indicates that real-time information about the deviation from the set course and information about potential tack change due to changed wind direction were more helpful for less experienced windsurfers and those with lower sports level.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Sports Level**} & \multirow{2}{*}{**N**} & \multicolumn{2}{c}{**Gender**} & \multicolumn{2}{c}{**Age**} & \multicolumn{2}{c}{**Height**} & \multicolumn{2}{c}{**Body Mass**} & \multirow{2}{*}{**BMI**} & \multicolumn{2}{c}{**Experience** [**Years**]} \\ \cline{3-3} \cline{5-8}  & & **F** & **M** & **[Years]** & **[cm]** & **[kg]** & **[kg]** & **[Years]** \\ \hline Rank 1 & \multirow{2}{*}{3} & \multirow{2}{*}{1} & \multirow{2}{*}{2} & \multirow{2}{*}{17.9 \(\pm\) 0.9} & \multirow{2}{*}{181.3 \(\pm\) 14.6} & \multirow{2}{*}{67.3 \(\pm\) 16.3} & \multirow{2}{*}{20.2 \(\pm\) 1.87} & \multirow{2}{*}{6.0 \(\pm\) 1.0} \\ Regional Junior Team & & & & & & & \\ Rank 2 & & & & & & & \\ National Junior Team & & & & & & & \\ Rank 3 & & & & & & & \\ National Senior Team & & & & & & & & \\ \hline Total & 13 & 7 & 6 & 21.4 \(\pm\) 4.3 & 174.6 \(\pm\) 9.5 & 64.0 \(\pm\) 8.6 & 20.9 \(\pm\) 1.46 & 9.5 \(\pm\) 4.0 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Mean values and standard deviations of age, height, body mass, BMI, and sports experience in different sports level participants according to rank category.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \multicolumn{2}{c}{**Competition Experience**} & \multicolumn{2}{c}{**Sports Level**} \\ \hline
**Question** & **Spearman’s Rho** & \(p\) & **Spearman’s Rho** & \(p\) \\ \hline
1 & \(-\)0.02 & 0.942 & 0.05 & 0.883 \\
2 & 0.01 & 0.973 & 0.13 & 0.673 \\
3 & \(-\)0.47 & 0.104 & \(-\)0.51 & 0.077 \\
4 & 0.07 & 0.825 & \(-\)0.16 & 0.603 \\
5 & \(-\)0.30 & 0.323 & \(-\)0.23 & 0.440 \\
6 & \(-\)0.68 & 0.010 & \(-\)0.63 & 0.020 \\
7 & \(-\)0.78 & 0.001 & \(-\)0.65 & 0.015 \\
8 & \(-\)0.30 & 0.316 & \(-\)0.47 & 0.106 \\ \hline \hline \end{tabular}
\end{table}
Table 2: [PERSON]’s rank correlations coefficients between answers from the questionnaire (Q1–Q8) and competition experience as well as sports level.  
The differences in mean response values between the senior and junior groups were evaluated (Table 3). For Q6 and Q7, average values were significantly higher in the junior group than in the senior group (\(p<0.05\)).