“…Moreover, we can use questionnaires or scales to understand more subjective mental states [ 16 , 42 ]. Commonly used questionnaires are the Profile of Mood States (POMS) [ 33 , 34 , 43 ], Life Satisfaction Index [ 5 , 16 , 44 ], stress scale [ 28 ], and depression related scale [ 6 , 15 , 18 , 24 ]. Many studies have explored how contact with nature and engagement in horticultural activities affects mental states [ 5 , 6 , 7 , 16 , 33 , 34 , 42 ].…”