condition mean min max ZT0-3 15.208974999999999 15.030149999999999 15.3878 ZT4-7 14.41825 14.41825 14.41825 ZT8-11 7.88227 7.88227 7.88227 ZT12-15 0 0 0 ZT16-19 14.1447 14.1447 14.1447 ZT20-23 20.89875 20.89875 20.89875