Table 2.

The modified Jadad scale.

Item	Score
Randomization
Not randomized or inappropriate method of randomization.	0
The study was described as randomized and the method of randomization was appropriate.	2
Concealment of allocation
Not describing the method of allocation concealment.	0
The study was described as using allocation concealment method and it was appropriate.	1
Double blinding
No blind or inappropriate method of blinding.	0
The study was described as double blind and the method of it was appropriate.	1
Withdrawals and dropouts
Not describing the follow-up.	0
A description of withdrawals and dropouts.	1
Inclusion/exclusion criteria
No clear description of the inclusion/exclusion criteria.	0
A clear description of the inclusion/exclusion criteria.	1
Statistical analysis
Not describing the method of statistical analysis.	0
Describing the method of statistical analysis.	1