Table 2.

K agreement calculation. Proportion of agreement (Po) = 0.855; agreement expected (Pe) = 0.4105; K agreement = 0.754. No agreement: 0.0–0.20; slight agreement: 0.21–0.40; fair agreement: 0.41–0.60; moderate agreement: 0.61–0.80; substantial agreement: 0.81–1.00). The K agreement was calculated from 36 articles to include 15 articles with the application of the inclusion and exclusion criteria.

		Reviewer 2	Reviewer 2	Reviewer 2
		Include	Exclude	Unsure	Total
Reviewer 1	include	15	2	1	18
Reviewer 1	exclude	0	13	0	13
Reviewer 1	unsure	1	3	1	5
	total	16	18	2	36