Table 5.

Summary of the checklist for measuring internal validity (risk of bias).

Studies	Was an Attempt Made to Blind Study Subjects to the Intervention they had Received	Was an Attempt Made to Blind those Measuring the Main Outcomes of the Intervention	If any of the Results of the Study were Based on “Data Dredging”, was this Made Clear?	In Trials/Cohort Studies, do the Analyses Adjust for Different Lengths of Follow-Up of Patients, or in Case Control Studies, is the Time Period between the Intervention and Outcome the Same for Cases and Controls	Were the Statistical Tests Used to Assess the Main Outcomes Appropriate	Was Compliance with the Intervention/s Reliable?	Were the Main Outcome Measures Used Accurate (Valid and Reliable)?
[22]	0	0	0	1	1	0	1
[27]	0	0	0	1	0	0	1
[32]	0	0	0	1	0	0	1
[24]	0	0	0	1	0	0	1
[13]	0	0	0	1	1	0	1
[23]	0	0	0	1	0	0	1
[33]	0	0	0	1	1	0	1
[21]	0	0	0	1	1	0	1
[34]	0	0	0	1	1	0	1
[29]	0	0	0	1	1	0	1
[20]	0	0	0	1	0	0	1
[31]	0	0	0	1	1	0	1
[28]	0	0	0	1	1	0	1
[30]	0	0	0	1	1	0	1
[35]	0	0	0	1	1	0	1
[26]	0	0	0	1	1	0	1
[36]	0	0	0	1	1	0	1
[37]	0	0	0	1	1	0	1
[25]	0	0	0	1	1	0	1