Operation Manual
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Evaluation of results
Body mass index (BMI)
The body mass index (BMI) is a number that is often called upon to evaluate body weight. The
number is calculated from body weight and height, the formula is – body mass index = body
weight : height². The measurement unit for BMI is [kg/m²]. According to the BMI, weight is clas-
sifi ed for adults (20 years and over) using the following values (source: WHO):
Category BMI
Underweight Severely underweight < 16
Moderately underweight 16-16,9
Slightly underweight 17-18,4
Normal weight 18,5-25
Overweight Pre-obese 25,1-29,9
Obese (overweight) Class I obese 30-34,9
Class II obese 35-39,9
Class III obese ≥ 40
11 Results in relation to time
Remember that only long-term trends are important. Short-term fl uctuations in weight
over a few days are usually the result of a loss of fl uid.