“…Study designs included 16 randomized controlled trials (RCT) from 12 articles (Berto 2005;Chen, Lai, and Wu 2011;Cimprich and Ronis 2003;Hartig et al 1996;2003;Hartig, Mang, and Evans 1991;Laumann, Gärling, and Stormark 2003;Mayer et al 2009;Perkins, Searight, and Ratwik 2011;Rich 2008;Stark 2003; van den Berg, Koole, and van der Wulp 2003); 7 randomized crossover trials from 6 articles 2012;Bodin and Hartig 2003;Johansson, Hartig, and Staats 2011;Shin et al 2011;Taylor and Kuo 2009); 3 natural experiments (Kuo 2001;Taylor, Kuo, and Sullivan 2002;Tennessen and Cimprich 1995); 3 nonrandomized controlled trials (Berto 2005;Hartig, Mang, and Evans 1991;Wu et al 2008); and 2 nonrandomized crossover trials (Ottosson and Grahn 2005;van den Berg and van den Berg 2011).…”