condition mean min max ZT0-3 1.37399575 1.1036865 1.644305 ZT4-7 0.8896055 0.8896055 0.8896055 ZT8-11 3.15339 3.15339 3.15339 ZT12-15 0 0 0 ZT16-19 3.8312299999999997 3.8312299999999997 3.8312299999999997 ZT20-23 1.934475 1.934475 1.934475