condition mean min max ZT0-3 34.5833 31.912300000000002 37.2543 ZT4-7 42.582750000000004 42.582750000000004 42.582750000000004 ZT8-11 45.75105 45.75105 45.75105 ZT12-15 0 0 0 ZT16-19 48.5868 48.5868 48.5868 ZT20-23 41.58625 41.58625 41.58625