Do Papers with Japanese Authors Have a Different Number of Authors? A Follow-Up Study after 25 Years and Implication for Other Countries

A follow-up study was conducted 25 years after the 1997 British Medical Journal report. Articles with at least one Japanese author were defined as ‘Article by Japanese’ and those with no Japanese authors were defined as ‘Article by Non-Japanese’. The number of authors per article for the years 2000, 2010, and 2020 in Circulation, Circulation Research, and the Japanese Circulation Journal was studied. Results are: (1) In all journals and all years covered, ‘Article by Japanese’ had more authors per article than ‘Article by Non-Japanese’. Twenty-five years later, the results were similar. (2) Comparison by year revealed that all journals showed increases with time in the number of authors per article. We have discussed the problem of the Science Council of Japan’s statement, influence on practising physicians and sample providers, and influence on international collaborations. This 25-year follow-up study highlights once again the need for global discussions on the qualifications for authorship in research studies