condition mean min max ZT0-3 1510.35 1510.35 1510.35 ZT4-7 2419.2 2419.2 2419.2 ZT8-11 2114.8999999999996 2114.8999999999996 2114.8999999999996 ZT12-15 1857.35 1857.35 1857.35 ZT16-19 1547.1 1547.1 1547.1 ZT20-23 1385.3000000000002 1385.3000000000002 1385.3000000000002