condition mean min max ZT0-3 41.776832 41.776832 41.776832 ZT4-7 28.371170499999998 28.371170499999998 28.371170499999998 ZT8-11 33.6443245 33.6443245 33.6443245 ZT12-15 56.8055195 56.8055195 56.8055195 ZT16-19 68.8495205 68.8495205 68.8495205 ZT20-23 66.292731 66.292731 66.292731