condition mean min max ZT0-3 1.9852333333333334 1.6494300000000002 2.6357150000000003 ZT4-7 0.877787 0.877787 0.877787 ZT8-11 1.0906514999999999 1.0906514999999999 1.0906514999999999 ZT12-15 1.4167939999999999 0.846193 1.987395 ZT16-19 1.73505 1.73505 1.73505 ZT20-23 1.570629 1.570629 1.570629