condition mean min max ZT0-3 531.46935235 415.4919817 647.446723 ZT4-7 389.13800312499995 314.34832305 463.9276832 ZT8-11 726.420998 595.2981411000001 857.5438549 ZT12-15 539.2287446500001 378.00371175000004 700.45377755 ZT16-19 138.68811900999998 111.61065352 165.7655845 ZT20-23 49.8756578375 34.75864877 64.992666905