An indicator of body density as determined by the relationship of body weight to body height. BMI=weight (kg)/height squared (m2). BMI correlates with body fat (adipose tissue). Their relationship varies with age and gender. For adults, BMI falls into these categories: below 18.5 (underweight); 18.5-24.9 (normal); 25.0-29.9 (overweight); 30.0 and above (obese). (National Center for health statistics, Centers for disease Control and Prevention)