FatOK estimates the fitness state from the four points of view:
1. Health (waist-to-height ratio)
2. Traditional body mass index (the estimation of "thickness or thinness" by weight and height)
3. US Army Body Fat Standard (the estimation of the body fat percentage by the height and the circumferences of waist, neck and may be hips)
4. Fitness (using the "military" method above to estimate the body fat percentage)
The first method (waist-to-height) works not only for adults but for children also.
FatOK also estimates the caloric intake needed to decrease, maintain or increase the body fat percentage.
FatOk works in close cooperation with the Apple iPhone Health app. In particular it stores the weight, waist circumference and the body fat percentage in the common Health App database and you may watch their plots with time in the Health App.
In general FatOK estimations of the fitness are approximately valid for the adults of the age 21 years old or older. Military Body Fat Standard, body fat percentage and caloric intake estimates are approximately correct only for the adults of the age 17 years and older. The Waist-to-height ratio estimations are approximately valid not only for adults, but for children also.
You should be aware the FatOK gives only the estimations. This estimations are approximately correct for the majority of people but not for all. In case of doubt always seek the advice of your physician or other qualified health provider.
FatOK is not medical device or application. It is not designed or intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment, or prevention of disease.