For surgery, we look at the height-to-weight ratio rather than weight. We calculate weight / height square meters. We call this the body mass index. Based on this value, we decide whether the patient is suitable for surgery. Of course, we don’t just make a decision. The World Health Organization and the health system of our own country, the health system in Europe, we all act according to this guideline. So our measure is body mass index. If a 90 kg person of the same weight is 1.55 tall, his body mass index is higher, so he may be suitable for surgery, but a 90 kg 1.70 tall person may not be suitable for surgery.