condition mean min max ZT0-3 881.4058333333334 726.562 1080.9750000000001 ZT4-7 721.0575 721.0575 721.0575 ZT8-11 243.10250000000002 243.10250000000002 243.10250000000002 ZT12-15 321.31050000000005 287.5025 355.11850000000004 ZT16-19 402.555 402.555 402.555 ZT20-23 590.1365000000001 590.1365000000001 590.1365000000001