condition mean min max ZT0-3 0.32497475 0.28306549999999997 0.366884 ZT4-7 0.2598735 0.2598735 0.2598735 ZT8-11 0.237625 0.237625 0.237625 ZT12-15 0 0 0 ZT16-19 0.334697 0.334697 0.334697 ZT20-23 0.232949 0.232949 0.232949