The perceived health of residents increases as the amount of green space increases within 3 km of their homes, regardless of how urban the respondents' homes are. 15.5% of respondents living near the lowest amount of green space (10% of the land within 3 km of their homes) reported feeling unhealthy, while only 10.2% of respondents whose homes are surrounded by 90% green space reported feeling unhealthy.
Maas, Jolanda, Robert A. Verheij, Peter P. Groenewegen, Sjerp De Vries, and Peter Spreeuwenberg. (2006). Green space, urbanity, and health: How strong is the relation? Journal of Epidemiol Community Health, 60(7), 587-592.