Table 1.

Search strategy used for OVID Medline database

Line #	Search terms
1	(old* OR senior* OR elder* OR geriatric*).ti,ab
2	aged/
3	1 OR 2
4	(lonel* OR social-isolation OR social-support OR social-deprivation).ti,ab
5	social-isolation/ OR loneliness/
6	4 OR 5
7	(communi* OR neighbo?r* OR cultur* OR polic* OR built environment* OR soci?-ecolog* OR environment* OR societ* OR ecologic?-model).ti,ab
8	*social-environment/ OR health-policy/ OR *residence-characteristics/
9	7 OR 8
10	3 AND 6 AND 9

Wildcards (*, ?) used for truncation and alternate spellings. Medical Subject Headings (MeSH) terms denoted by ‘/’. Boolean operators used as denoted in search term lines