In Chinese men and women, measuring belly fat with QCT scans is closely related to total body fat measured by DXA scans, with the strength of the relationship varying by sex and where the belly scan is taken.

For Chinese men, combining belly fat measurements from a single CT slice at the L1/L2 level with BMI can accurately estimate total body fat, accounting for 83% of the variation seen in DXA scans.

For Chinese women, using belly fat measurements from a CT slice at the L5/S1 level along with body weight can predict total body fat with 81% accuracy compared to DXA scans.

Using existing CT scans for belly fat analysis with QCT doesn't add any extra radiation, making it a safe way to check body fat without extra scans.

When testing the belly fat prediction equations in men, the average difference from DXA measurements was small (1.31%), with most predictions falling within a range of -4.08% to 6.71%.

When measuring belly fat volume, QCT and DXA scans give very similar results in Chinese men and women, with men showing almost perfect agreement and women showing very strong agreement.