condition mean min max ZT0-3 0.78800325 0.43798899999999996 1.1380175000000001 ZT4-7 0.517638 0.517638 0.517638 ZT8-11 0.8992009999999999 0.8992009999999999 0.8992009999999999 ZT12-15 0 0 0 ZT16-19 3.15921 3.15921 3.15921 ZT20-23 1.800395 1.800395 1.800395