condition mean min max ZT0-3 652.152016 652.152016 652.152016 ZT4-7 758.829374 758.829374 758.829374 ZT8-11 920.487483 920.487483 920.487483 ZT12-15 907.0186565 907.0186565 907.0186565 ZT16-19 792.3018315 792.3018315 792.3018315 ZT20-23 507.4967705 507.4967705 507.4967705