condition mean min max ZT0-3 1.5614584784999999 1.4949688769999998 1.62794808 ZT4-7 3.0167965265000003 2.5941697645 3.4394232885000005 ZT8-11 4.40239698475 4.2007085645 4.604085405 ZT12-15 2.429211379 1.818152204 3.040270554 ZT16-19 0.66219501525 0.6580512565000001 0.666338774 ZT20-23 0.31958858725 0.105571671 0.5336055035