condition mean min max ZT0-3 1.5930775000000001 1.291755 1.8944 ZT4-7 2.46819 2.46819 2.46819 ZT8-11 6.576575 6.576575 6.576575 ZT12-15 0 0 0 ZT16-19 3.188225 3.188225 3.188225 ZT20-23 2.145725 2.145725 2.145725