condition mean min max ZT0-3 45.48116666666667 19.4128 61.921099999999996 ZT4-7 32.424099999999996 32.424099999999996 32.424099999999996 ZT8-11 36.815799999999996 36.815799999999996 36.815799999999996 ZT12-15 54.226549999999996 47.5945 60.858599999999996 ZT16-19 36.844750000000005 36.844750000000005 36.844750000000005 ZT20-23 47.661950000000004 47.661950000000004 47.661950000000004