The report cited "direct and indirect pressure" from senior staff in the office of then-World Bank President Jim Yong Kim to change the report's methodology to boost China's score, and said it likely occurred at his direction.

It said it found that then-CEO Kristalina Georgieva, now the managing director of the International Monetary Fund, and a key adviser pressured staff to "make specific changes to China's data points" and boost its ranking, at a time when the bank was seeking China's support for a big capital increase.

Georgieva, in a statement, rejected the findings of the probe and said she had met with the IMF's executive board to discuss the matter.

(Reporting by Andrea Shalal and David Lawder)