The Synthesis Report presents the main results of the surveys that have been carried as part of the project PREHealth in the 4 participating cities. The locations where the face-to-face surveys have been carried out in selected open spaces are presented, followed by explanations regarding the specific characteristics of the face-to-face and online surveys. The main findings of the face-to-face and online surveys are presented and a detailed comparison of the differences and similarities identified is included. The main results of the correlation analysis between the profile characteristics of open space visitors and their behavioural characteristics are presented with reference to the four cities that took part in the research. Finally the conclusions are presented.