condition mean min max ZT0-3 37.740899999999996 30.44165 45.04015 ZT4-7 68.45609999999999 68.45609999999999 68.45609999999999 ZT8-11 48.346000000000004 48.346000000000004 48.346000000000004 ZT12-15 0 0 0 ZT16-19 46.4649 46.4649 46.4649 ZT20-23 55.08715 55.08715 55.08715