In his Studies on the Population of China, Ho Ping-ti suggests revising the 1393 census to 65 million people, noting that large areas of North China and frontier areas were not counted in that census.
I sine Studies on the Population of China fra 1959, foreslog Ho Ping-ti at revidere tallene for 1393 til 65 millioner mennesker, fordi store områder i Nordkina og i grænseområderne ikke var blevet taget med i folketællingen.