## 3 Materials and Methods  
### Materials  
The sixth edition 'Report on the Quality of Life in European Cities' [19] was carried out by IPSOS at the request of the European Commission's Directorate-General for Regional and Urban Policy, between January and April 2023. The survey encompasses 83 cities from the European Union, European Free Trade Association (EFTA) countries, the United Kingdom, the Western Balkans, and Turkiye [47]. Respondents were asked to evaluate their satisfaction with different aspects of urban life, such as inclusivity, social isolation, employment opportunities, safety, housing, environmental conditions, transportation, cultural offerings, city services, and levels of corruption. In each city, at least 839 residents were interviewed, resulting in a total of 71,153 completed interviews [19; 47]. In the area of quality of life, respondents were asked about their views on ten different aspects (criteria) that influence overall well-being. They were posed the question: \"To what extent are you satisfied or dissatisfied with each of the following in your city?\" The criteria evaluated included:  
* C1--Public transport, for example the bus, tram, or metro. * C2--Health care services, doctors, and hospitals. * C3--Sport facilities such as sport fields and indoor sports halls. * C4--Cultural facilities such as concert halls, theatres, museums, and libraries. * C5--Green spaces such as parks and gardens. * C6--Public spaces such as markets, squares, and pedestrian areas. * C7--Schools and other educational facilities. * C8--The quality of the air. * C9--The noise level. * C10--Cleanliness. Respondents could provide their answers using a 5-point measurement scale: 1--Very unsatisfied, 2--Rather unsatisfied, 3--Rather satisfied, 4--Very satisfied, and 99--Don't know/No Answer/Refused. Figure 1 presents a part of the 'Quality of Life in European Cities' aggregated survey data assignment sheet available on the website 'Inforegio--Quality of Life in European Cities' [47]. Additionally, respondents answered a general question regarding satisfaction with living in the city (QSL) using, as before, a 5-point measurement scale. QSL: To what extent do you agree or disagree with each of the following statements?--I'm satisfied to live in my city. The sociodemographic characteristics of respondents are presented in Tables 1-3. Based on the data presented in Table 4, 0.544% of respondents from Zurich reported being \"Very unsatisfied\" with public transport (C1), while 4.735% indicated they were \"Rather unsatisfied\". In contrast, 18.525% were \"Rather satisfied\", and a significant 75.983% were \"Very satisfied\" with public transport services. Additionally, 0.216% of respondents selected \"Don't know\", provided no answer, or refused to respond to this question. Descriptive statistics of responses grouped by category and further detailed by criteria are included in Table 5. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**City** & **Category \({}^{*}\)** & **C1** & **C2** & **C3** & **C4** & **C5** & **C6** & **C7** & **C8** & **C9** & **C10** \\ \hline \multirow{6}{*}{Zürich} & 1 & 0.544\% & 1.842\% & 1.843\% & 1.058\% & 2.198\% & 1.596\% & 2.373\% & 2.661\% & 4.732\% & 2.256\% \\ \cline{2-10}  & 2 & 4.735\% & 4.883\% & 5.411\% & 1.952\% & 8.995\% & 9.976\% & 3.476\% & 8.206\% & 17.696\% & 8.657\% \\ \cline{2-10}  & 3 & 18.522\% & 26.298\% & 43.431\% & 29.067\% & 41.020\% & 54.640\% & 34.977\% & 52.781\% & 48.605\% & 48.132\% \\ \cline{2-10}  & 4 & 75.983\% & 65.980\% & 38.631\% & 65.341\% & 47.208\% & 33.689\% & 49.527\% & 35.238\% & 27.342\% & 40.747\% \\ \cline{2-10}  & 99 & 0.216\% & 0.996\% & 10.683\% & 2.582\% & 0.578\% & 0.099\% & 9.646\% & 1.115\% & 1.625\% & 0.209\% \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Assessment of Zürich.