condition mean min max ZT0-3 2486.0 2486.0 2486.0 ZT4-7 1903.2 1903.2 1903.2 ZT8-11 1770.0500000000002 1770.0500000000002 1770.0500000000002 ZT12-15 1704.35 1704.35 1704.35 ZT16-19 2125.1499999999996 2125.1499999999996 2125.1499999999996 ZT20-23 2427.6000000000004 2427.6000000000004 2427.6000000000004