condition mean min max ZT0-3 1.0822288333333334 0.6823250000000001 1.31612 ZT4-7 0.9977775 0.9977775 0.9977775 ZT8-11 0.9386000000000001 0.9386000000000001 0.9386000000000001 ZT12-15 1.26228775 0.9516405000000001 1.5729350000000002 ZT16-19 1.601205 1.601205 1.601205 ZT20-23 2.204925 2.204925 2.204925