condition mean min max ZT0-3 461.285 461.285 461.285 ZT4-7 321.522112 321.522112 321.522112 ZT8-11 401.0844325 401.0844325 401.0844325 ZT12-15 501.958802 501.958802 501.958802 ZT16-19 306.624216 306.624216 306.624216 ZT20-23 257.648648 257.648648 257.648648