condition mean min max ZT0-3 1.0096990000000001 0.9464955 1.0729025 ZT4-7 1.665165 1.665165 1.665165 ZT8-11 1.836525 1.836525 1.836525 ZT12-15 0 0 0 ZT16-19 2.0559950000000002 2.0559950000000002 2.0559950000000002 ZT20-23 1.5087549999999998 1.5087549999999998 1.5087549999999998