condition mean min max ZT0-3 1.414485 1.367 1.46197 ZT4-7 0.93225 0.93225 0.93225 ZT8-11 1.3389389999999999 1.3389389999999999 1.3389389999999999 ZT12-15 0 0 0 ZT16-19 2.898685 2.898685 2.898685 ZT20-23 1.7775500000000002 1.7775500000000002 1.7775500000000002