condition mean min max ZT0-3 1.1267125 0.835896 1.417529 ZT4-7 0.7468954999999999 0.7468954999999999 0.7468954999999999 ZT8-11 0.2027655 0.2027655 0.2027655 ZT12-15 0 0 0 ZT16-19 1.1898810000000002 1.1898810000000002 1.1898810000000002 ZT20-23 1.62314 1.62314 1.62314