## Online-Calculator to calculate the Body Shape Index (BSI or ABSI)

### ABSIz in Waist-Weight-Diagram with risk categories

### ABSI in ABSI-Age-Diagram with ABSI-Mean and ABSI-Standard deviation

## Waist-Weight-Diagram

In the waist-weight diagram is very nice to see that a pure weight reduction does not necessarily mean a better risk class. For the ABSI the waist circumference is a significant influence. With a weight reduction, the star only moves to the left in the diagram. This can lead to a poorer risk class. Only when the waist circumference diminishes, the star also moves downwards. Thus, a weight gain, if it is by muscle build-up and thus not the waist circumference increases to a better risk class lead.

## Calculation formula for the Body Shape Index (BSI or ABSI)

The Body Shape Index (ABSI) says something about the body sheer division. The higher the ABSI, the higher the proportion of abdominal fat compared to other body parts, such as muscles or under-the-skin fat, on the arms, legs or upper body.

$\mathrm{ABSI}=\frac{U}{{\mathrm{BMI}}^{\frac{2}{3}}\cdot \sqrt{L}}$

with U : waist size in m, L : height in m and BMI : Body Mass Index

The risk index ABSIz is calculated using the empirically determined table values for the ABSI for men and women.

$\mathrm{ABSIz}=\frac{\mathrm{ABSI}-{\mathrm{ABSI}}_{\mathrm{mean}}(\mathrm{age,\; gender})}{{\mathrm{ABSI}}_{\mathrm{std}}(\mathrm{age,\; gender})}$

with the indices mean : Mean value und std : Standard deviation

The body mass index (BMI) is a measure that sets the weight in the ratio to the square of the body weights.

$\mathrm{BMI}=\frac{m}{{L}^{2}}$

with m : weight in kg, L : height in m

The relationship between waist size and weight is as follows:

$U=\left(\mathrm{ABSIz}\cdot {\mathrm{ABSI}}_{\mathrm{std}}(\mathrm{age,\; gender})+{\mathrm{ABSI}}_{\mathrm{mean}}(\mathrm{age,\; gender})\right)\frac{{m}^{\frac{2}{3}}}{{L}^{\frac{5}{6}}}$

## ABSI Risk Categories

The ABSI z value is grouped in five risk categories.

ABSIz Value |
Risk |

Less than -0.868 |
Very low |

Between -0.868 and -0.272 |
Low |

Between -0.272 and +0.229 |
Average |

Between +0.229 and +0.798 |
High |

Greater than +0.798 |
Very high |

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## Measurement of the waist circumference

To measure the waist circumference according to the recommendations of the World Health Organization, you should stand upright and distribute the weight evenly on both legs. The arms should hang loosely at the side. Now the top of the pelvic scoop and the lower point of the lower ribbed arch are to be used. A measuring tape is applied at the center between these two points and is guided around the waist parallel to the floor. The measurement should be done at the end of the exhalation without straining the waist. It is best to inhale deeply, then exhale and stop the air and then carry out the measurement.

## Interpretation of the ABSI

The calculated ABSI says something about the body's sheer division. The higher the ABSI, the higher the proportion of abdominal fat compared to other body parts, such as muscles or under-skin fat, on the arms, legs or upper body.
Since the ABSI is age-dependent and gender-dependent, we calculate the ABSI-Z value. An ABSI-Z value of 0.0 indicates that your ABSI is exactly the same on average for all persons of the same age and gender. If the ABSI-Z value is above this, it means that your ABSI is above the average of all persons of the same age and gender. At higher ABSI-Z values, the relative risk of death is also higher. Conversely, their ABSI is below-average if the ABSI-Z value is less than 0.0.
The relative risk of death due to the ABSI is whether or not your risk is increased or decreased over individuals of the same age and gender in a particular period of time. A relative risk of 1.0 means an average risk. A relative risk of 1.2 means a 20% increase in risk. A relative risk of 0.8 means a 20% reduced risk.
Please note that the risk calculated here is based only on the body model and other factors which also influence the life expectancy, such as illnesses, life habits, Of course, the value calculated here does not replace a medical consultation and provides only a clue.

Reference: Center for Endokrinologie and Metabolism Nymphenburg

The calculation is made according to Krakauer, Nir Y.; Jesse C. Krakauer (2012-07-18): A New Body Shape Index Predicts Mortality Hazard Independently of Body Mass Index