condition mean min max ZT0-3 30.558999999999997 30.558999999999997 30.558999999999997 ZT4-7 28.40915 28.40915 28.40915 ZT8-11 19.143099999999997 19.143099999999997 19.143099999999997 ZT12-15 20.23585 20.23585 20.23585 ZT16-19 25.69285 25.69285 25.69285 ZT20-23 27.8289 27.8289 27.8289