Table 2. The modified Jadad score Note: aDouble-blind got 1 score; single-blind got 0.5 score.

Item assessed	Response	Score
Was the study described as randomized?	Yes No	+1 0
Was the method of randomization appropriate?	Yes Not described No	+1 0 -1
Was the study described as blinded?	Yes No	+1 0
Was the method of blinding appropriate?	Yes Not described No	+1 0 -1
Was there a description of withdrawals and dropouts?	Yes No	+1 0
Was there a clear description of the inclusion/exclusion criteria?	Yes No	+1 0
Was the method used to assess adverse effects described?	Yes No	+1 0
Was the method of statistical analysis described?	Yes No	+1 0