Chapter 3: Weight Management 59 than percent body fat since both methods take into consideration the location of fat and not just the amount. Relative risk ratings for WHR are provided in Table 3.8. Table 3.8. Relative Health Risk Ratings for Waist to Hip Ratio Gender Excellent Good Average At Risk Males < 0.85 0.85 - 0.89 0.90 - 0.95 ≥ 0.95 Females < 0.75 0.75 - 0.70 0.80 - 0.86 ≥ 0.86 Body mass index (BMI). BMI provides a descriptive ratio between body weight and height. Although BMI may be a relatively accurate predictor of health risk for most individuals, it has been shown to over predict health risk for individuals who are extremely muscular or have large frames. Additionally, BMI has been shown to under predict health risk for older individuals with decreased muscle mass and excess body fat. BMI is calculated by dividing one’s weight in kilograms (kg) by the square of one’s height in meters (m) [BMI = wt (kg) / ht2 (m)]. Table 3.9. provides the different BMI classifications. Table 3.10 is a quick reference chart to determine BMI classification. Table 3.9. BMI Classifications. Weight Categories BMI (kg / m2) Underweight 18.5 Healthy Weight 18.5 - 24.9 Overweight 25 - 29.9 Obese 30 - 34.9 Severely Obese 35 - 39.9 Morbidly Obese ≥ 40
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