Editing Decompression sickness (section)

==="Undeserved" decompression sickness===
A common misconception or misnomer is "undeserved" decompression sickness, which is more accurately decompression sickness that was not predicted by the algorithm or tables used. The algorithms and tables calculated from them use a simplistic mathematical model to predict decompression sickness which uses the dive profile as input and a mathematical approximation of tissue gas dynamics which omits a number of factors which are known or suspected to exist, but for which there is no known tested and reliable model to take the effects of these factors into account. In several cases there is also no currently available way to measure the factors in a meaningful way, so they are either simply omitted, or an arbitrary manual or programmed input used to produce a more conservative, therefore "safer" profile, but the reduction in risk is generally unknown. When these necessarily oversimplified models occasionally fail, some divers claim that the decompression symptoms were "undeserved" as they followed the directions of the computed schedule.<ref name="Pollock 2023b" />