. Author manuscript; available in PMC: 2016 Nov 1.

Published in final edited form as: Am J Prev Med. 2015 Nov;49(5):772–783. doi: 10.1016/j.amepre.2015.04.003

Table 1.

Characteristics of Included Studies and Proportion of Studies Within Each Characteristic

Characteristic			No. of studies (% of all reviewed studies)
Country	US		24^{18–26,30,32–40,42–46} (77%)
Country	Non-US		7^{6,17,27–29,31,41} (23%)
Setting	Healthcare system	All	24^{6,19–26,29–31,33–41,43–45}
		VA system	3^21–23
	Community-based	All	7^{17,18,27,28,32,42,46}
		Worksite	2^27,28
Control group	No control group		5^{29,31,38,40,42} (16%)
	Control received usual care		25^{6,17–28,30,32–37,39,41,43–45} (81%)
	Treated control		1⁴⁶ (3%)
Publication period	1980s		4^19,27,28,41 (13%)
	1990s		5^{31,32,36,39,43} (16%)
	2000s		14^{6,17,18,20,24,26,29,30,33,37,38,40,42,45} (45%)
	2010s		8^{21–23,25,34,35,44,46} (26%)

VA, U.S. Department of Veterans Affairs