condition mean min max ZT0-3 39.72861666666667 31.782400000000003 49.4574 ZT4-7 33.079750000000004 33.079750000000004 33.079750000000004 ZT8-11 37.074799999999996 37.074799999999996 37.074799999999996 ZT12-15 63.315625 62.68355 63.9477 ZT16-19 55.3024 55.3024 55.3024 ZT20-23 66.53059999999999 66.53059999999999 66.53059999999999