condition mean min max ZT0-3 0.7559765 0.7559765 0.7559765 ZT4-7 1.38791 1.38791 1.38791 ZT8-11 7.66131 7.66131 7.66131 ZT12-15 7.07502 7.07502 7.07502 ZT16-19 6.8405249999999995 6.8405249999999995 6.8405249999999995 ZT20-23 1.380395 1.380395 1.380395