condition mean min max ZT0-3 42.29483333333333 25.31175 57.15855 ZT4-7 34.50735 34.50735 34.50735 ZT8-11 53.787549999999996 53.787549999999996 53.787549999999996 ZT12-15 67.424025 56.69125 78.1568 ZT16-19 70.79555 70.79555 70.79555 ZT20-23 41.99435 41.99435 41.99435