Comparison of quality of Japanese RCTs classified by international indexing and journal publisher's location.

%: The proportion of “yes” in each criterion of the 2009 updated method guidelines for systematic reviews.
Group A: articles indexed in internationally databases and published in international journals.
Group B: articles indexed in internationally databases and published in Japanese journals.
Group C: articles non-indexed in international databases and published in Japanese journals.
*: p<0.05, compared with Group A by Holm's multiple comparison test.