condition mean min max ZT0-3 1.4776589999999998 0.761215 2.77939 ZT4-7 1.1663065 1.1663065 1.1663065 ZT8-11 1.301825 1.301825 1.301825 ZT12-15 3.029455 2.532355 3.526555 ZT16-19 1.8375650000000001 1.8375650000000001 1.8375650000000001 ZT20-23 0.9698359999999999 0.9698359999999999 0.9698359999999999