condition mean min max ZT0-3 2.3326025925 2.041795659 2.623409526 ZT4-7 1.17501136375 1.14886159 1.2011611375 ZT8-11 1.5192009055 1.1678162195000001 1.8705855915 ZT12-15 4.192170969 3.0344522950000004 5.349889643 ZT16-19 5.1085820585 4.5974251935 5.6197389235 ZT20-23 8.36628975575 7.30201087 9.4305686415