Q: Although my body composition has inproved form 28% to 16% I only lost 4 inches from my waist.Is this unusual?

A: It may be a little on a low side, but not that unusual. Your waist circumference depends not only on the amount of fat you carry but also on your frame. If you hips are wide, for example, you'll always have relatively large waist measure even if your body fat is low.

Another point to consider is that body fat measurements are notoriously imprecise, especially if you use handheld/bodyweight electronic scales. The best way to get your body fat checked is by a professional at the gym with calipers -- but even that is not guaranteed.

In either case, I would recommend not getting too fixated with numbers, either body fat or inches, but instead objectively judge your own appearence and well-being now compared to before. Going from 28% to 16% and/or losing 4 inches on the waist are both great accomplishments and should have significantly improved the way you look and feel -- congrats!