condition mean min max ZT0-3 3218.3500000000004 3218.3500000000004 3218.3500000000004 ZT4-7 4307.1 4307.1 4307.1 ZT8-11 3104.35 3104.35 3104.35 ZT12-15 2011.75 2011.75 2011.75 ZT16-19 1631.9499999999998 1631.9499999999998 1631.9499999999998 ZT20-23 2153.75 2153.75 2153.75