Table 5. External Validity Assessment of Included Manuscripts.

Year	Author	Study Classification	Sample adequately described	Sample representative	Outcomes adequately described	Outcomes valid for the study	Intervention adequately described	Findings clinically significant	Conclusion placed in literary context	Findings support conclusions	Number of Threats
2001	Sjodahl et al.	E5	•	•	•	•	•	•	•		2
2002	Sjodahl et al.	E5	•	•	•	•	•	•	•	•	0
2002	Yigiter et al.	E1	•	•	•	•	•	•	•	•	0
2003	Sjodahl et al.	E5	•	•	•	•	•	•	•	•	0
2003	Cole et al.	O6	•	•			•	•		•	3
2005	Faucher et al.	O6	•	•			•	•	•	•	2
2006	Black et al.	O6		•	•	•	•	•		•	2
2006	Isakov et al.	E1	•	•	•	•	•	•		•	1
2009	Barnett et al.	E3	•	•	•	•		•		•	2
2009	Hyland et al.	E1	•	•	•	•	•	•	•	•	0
2011	Darter et al.	O6	•		•	•	•	•		•	2
2012	Yang et al.	E5	•	•	•	•		•		•	2
2012	Highsmith et al.	X2	•				•		•	•	4*
2013	Agrawal et al.	E3	•	•	•	•	•	•	•	•	0
2013	Darter et al.	E3	•	•	•	•	•	•	•	•	0
2014	Lamberg et al.	E2	•	•	•	•	•	•	•	•	0
2014	Mikami et al.	O6	•	•	•	•		•	•	•	1
2014	Highsmith et al.	X2	•	•			•		•		4*

All manuscripts had high external validity except those noted with (*) which had moderate external validity. The three manuscripts by Sjodahl et al. represent a single project and are thus counted as a single “manuscript” for the purposes of this review and analysis. A dot in the box indicates the criteria was identified by reviewers whereas a blank box represents a criteria not identified.