1	((((“Environment”[Mesh]) OR “Social Environment”[Mesh]) OR “Environment Design”[Mesh]) OR “Environment and Public Health”[Mesh]) OR “Built Environment”[Mesh] OR environment OR “built environment” OR “environment design” OR “social environment” OR “walkable environment” OR neighborhood OR “neighborhood design”	8,250,202
2	(“motor activity”[MeSH Terms] OR (“motor”[All Fields] AND “activity”[All Fields]) OR “motor activity”[All Fields]) OR (“exercise”[MeSH Terms] OR “exercise”[All Fields] OR (“physical”[All Fields] AND “activity”[All Fields]) OR “physical activity”[All Fields] OR “Walking”[Mesh] OR “walking” [All Fields] OR walk*)	761,446
3	#1 AND #2	318,600
4	older* OR senior* OR elder*	642,438
5	#3 AND #4	33,182
6	Health [MEsh] OR health*	4,415,198
7	#5 AND #6	21,104
8	Review[ptyp] OR systematic[sb] OR Meta-Analysis[ptyp]	2,542,516
7	# 7 AND # 8	1878
8	(“2004/01/01”[PDAT]: “2019/12/31”[PDAT])	13,652,503
9	#7AND #8	1506
10	“aged” [MeSH Terms]	2,903,733
11	#9 AND #10	913