condition mean min max ZT0-3 1.0504992499999999 0.6813134999999999 1.4196849999999999 ZT4-7 1.366289 1.366289 1.366289 ZT8-11 0.7729604999999999 0.7729604999999999 0.7729604999999999 ZT12-15 0 0 0 ZT16-19 0.760502 0.760502 0.760502 ZT20-23 0.381777 0.381777 0.381777