condition mean min max ZT0-3 154.13612257 98.41806439 209.85418075 ZT4-7 458.106997025 407.27022055 508.9437735 ZT8-11 861.0689633000001 647.3865136500001 1074.75141295 ZT12-15 1500.7357627499998 1376.2207899999999 1625.2507354999998 ZT16-19 922.3032750750001 708.2160607000001 1136.3904894500001 ZT20-23 447.695300175 372.7402803 522.65032005