I'm just adding this for the generalised interest, nothing more:
File:Correlation between BMI and Percent Body Fat for Men in NCHS' NHANES 1994 Data.PNG - Wikipedia, the free encyclopedia
and
"In Singapore, the BMI cut-off figures were revised in 2005, motivated by studies showing that many Asian populations, including Singaporeans, have higher proportion of body fat and increased risk for cardiovascular diseases and diabetes mellitus, compared with Caucasians at the same BMI."
Body mass index - Wikipedia, the free encyclopedia