condition mean min max ZT0-3 22.799149999999997 22.799149999999997 22.799149999999997 ZT4-7 17.50625 17.50625 17.50625 ZT8-11 17.43715 17.43715 17.43715 ZT12-15 20.0424 20.0424 20.0424 ZT16-19 28.290950000000002 28.290950000000002 28.290950000000002 ZT20-23 26.95775 26.95775 26.95775