## 4 Conclusions  
This study attempted to provide broad information on the distribution of information on the fundamental frequency F0 for people who had undergone a total laryngectomy surgery and used oesophageal speech (ES). The obtained results located in the pitch listing were subjected to detailed statistical analysis. This analysis was to show significant differences in information on the F0 frequency between oesophageal speech (ES) and the speech of healthy people. Due to the specific features of the Polish language, which are related to the difficult articulation and pronunciation of some syllables, words used during the speech rehabilitation process were selected for the study. The selected words were not random and resulted from the recommendations of speech therapists. In this study, only single words were analysed, not full sentences. Analysis of full sentences is a more \begin{table}
\begin{tabular}{c c c c c} \hline \multicolumn{4}{c}{**Average Values of Fundamental Frequency F0 for the Tested Word “Bulka” (“a Bread Roll”)**} \\ \hline \multirow{3}{*}{**F0 Frequency**} & \multirow{3}{*}{**Healthy**} & \multirow{3}{*}{**Laryngeal**} & **Percentage Value in the Ratio of People Following Laryngectomy to Healthy People [\%]** & **Frequency** \\  & & & & **People** \\ \hline Mean pitch F0 [Hz] & 107.81 & 88.71 & 82.28 & 23.29 \\ Min. pitch F0 [Hz] & 90.56 & 82.22 & 90.79 & 24.94 \\ Max. pitch F0 [Hz] & 145.98 & 115.74 & 79.28 & 33.68 \\ Median F0 & 99.11 & 84.14 & 84.90 & 18.39 \\ Standard deviation F0 & 23.85 & 16.27 & 68.23 & 4.54 \\ \hline \end{tabular}
\end{table} 
Table 6: Set of values for the average fundamental frequency F0 for the tested word “bulka” (“a bread roll”). \begin{table}
\begin{tabular}{c c c c c} \hline \multicolumn{4}{c}{**Average Values of Fundamental Frequency F0 for the Tested Word “Paczka” (“a Package”)**} \\ \hline \multirow{3}{*}{**F0 Frequency**} & \multirow{3}{*}{**Healthy**} & \multirow{3}{*}{**Laryngeal**} & **Percentage Value in the Ratio of People Following Laryngectomy to Healthy People [\%]** & **Frequency** \\  & & & & **Ratio of People People** [\%] & **Difference—Healthy and Laryngectomized People** \\ \hline Mean pitch F0 [Hz] & 89.87 & 81.49 & 90.67 & 8.38 \\ Min. pitch F0 [Hz] & 58.74 & 59.74 & 101.71 & \(-\)1.00 \\ Max. pitch F0 [Hz] & 120.31 & 104.86 & 87.16 & 15.45 \\ Median F0 & 91.27 & 92.66 & 101.52 & \(-\)1.39 \\ Standard deviation F0 & 19.32 & 18.76 & 97.13 & 0.56 \\ \hline \end{tabular}
\end{table} 
Table 7: Set of values for the average fundamental frequency F0 for the tested word “paczka” (“a package”). \begin{table}
\begin{tabular}{c c c c c} \hline \multicolumn{4}{c}{**Average Values of Fundamental Frequency F0 for the Tested Word “Paczka” (“a Package”)**} \\ \hline \multirow{3}{*}{**F0 Frequency**} & \multirow{3}{*}{**Healthy**} & \multirow{3}{*}{**Laryngeal**} & **Percentage Value in the Ratio of People Following Laryngectomy to Healthy People [\%]** & **Frequency** \\  & & & & **Ratio of People** \\ \hline Mean pitch F0 [Hz] & 99.80 & 85.94 & 86.11 & 13.86 \\ Min. pitch F0 [Hz] & 90.09 & 72.37 & 80.34 & 17.71 \\ Max. pitch F0 [Hz] & 121.01 & 99.56 & 82.27 & 21.46 \\ Median F0 & 96.76 & 88.52 & 91.48 & 8.24 \\ Standard deviation F0 & 13.71 & 10.42 & 75.96 & 3.30 \\ \hline \end{tabular}
\end{table} 
Table 8: Set of values for the average fundamental frequency F0 for the tested word “snieg” (“snow”). complex task and will be carried out by the author in later studies. The results of the analysis clearly indicate a significantly higher fundamental frequency F0 average value for all the tested words for physiological speech. The highest F0 frequency difference between oesophageal speech and the speech of healthy individuals was noted for the word barrel (in Polish \"beczka\"), and it amounted to 23.29 Hz; the lowest F0 frequency difference was noted for the word package (in Polish \"paczka\"), and it amounted to 8.38 Hz. The set of maximum values of the F0 frequency of the tested word obtained from the pitch listing showed that the largest difference for max.