condition mean min max ZT0-3 289.50033333333334 201.495 339.581 ZT4-7 164.5195 164.5195 164.5195 ZT8-11 90.0113 90.0113 90.0113 ZT12-15 90.590025 76.8115 104.36855 ZT16-19 139.424 139.424 139.424 ZT20-23 257.9525 257.9525 257.9525