condition mean min max ZT0-3 3995.3999999999996 3995.3999999999996 3995.3999999999996 ZT4-7 4631.2 4631.2 4631.2 ZT8-11 3936.8500000000004 3936.8500000000004 3936.8500000000004 ZT12-15 2393.7 2393.7 2393.7 ZT16-19 1927.95 1927.95 1927.95 ZT20-23 3002.25 3002.25 3002.25