Original Article

North American (Panax quinquefolius) and Asian Ginseng (Panax ginseng) Preparations for Prevention of the Common Cold in Healthy Adults: A Systematic Review

Table 2

Methodological quality of included studies according to Jadad et al. [4] and Schultz et al. [5].

ReferenceDescribed as randomizedRandomization well described and appropriateOutcome assessment blindedBlinding well described and appropriateDescription of withdrawals and drop-outsTotal Jadad scoreAllocation concealment

McElhaney et al. [8], trial AYesNoYesNoNo2/5Unclear
McElhaney et al. [8], trial BYesNoYesNoNo2/5Unclear
McElhaney et al. [11]YesYesYesYesYes5/5Adequate
Predy et al. [10]YesYesYesYesYes5/5Adequate
Scaglione et al. [9]YesNoYesNoNo2/5Unclear