condition mean min max ZT0-3 1667.5500000000002 1667.5500000000002 1667.5500000000002 ZT4-7 1890.7 1890.7 1890.7 ZT8-11 2190.25 2190.25 2190.25 ZT12-15 2022.8000000000002 2022.8000000000002 2022.8000000000002 ZT16-19 1621.95 1621.95 1621.95 ZT20-23 1338.1999999999998 1338.1999999999998 1338.1999999999998