The numbers that you cite are correct, not just for Americans but for the British and Australians as well. Interestingly enough, apparently the Dutch colonial POWs of the Japanese suffered only? a 20% mortality, attributed to their better knowledge and practice of tropical medicine. My generation,I was a child during WW II, still thinks of them as JAPS, now a pejoritive term
The Dutch helped put down a Christian uprising in the island nation to help protect their status. In effect, they betrayed those who should have been their brothers and sisters in Christ. Granted, being Christians, those Japanese should not have uprose, but that is beside the point.
Dutch medical science was also used by Japanese doctors during their relative self-imposed isolation from the Western world.