Table 1.

The modified Jadad scale.

Classification	Score	Description
Randomization
Inappropriate	0	Semi-randomized or quasi-randomized trials
Unclear	1	Randomized trials without describing methods for generating random sequences
Appropriate	2	Random sequences produced by a computer or random number table
Allocation concealment
Inappropriate	0	Regular grouping
Unclear	1	Only use of a random number table or other random assignment scheme
Appropriate	2	A method for assigning sequences without prediction
Blinding
Inappropriate	0	Use of double blinding without an appropriate method
Unclear	1	Only a mention double blinding
Appropriate	2	A description of the specific and appropriate method of double blinding
Withdrawals or dropouts
No	0	No description of withdrawal or dropouts
Yes	1	A description of withdrawal or dropouts