condition mean min max ZT0-3 3.6871766666666668 1.49351 7.32447 ZT4-7 7.33985 7.33985 7.33985 ZT8-11 1.998965 1.998965 1.998965 ZT12-15 4.5116025 3.7171399999999997 5.306065 ZT16-19 2.634985 2.634985 2.634985 ZT20-23 3.8740750000000004 3.8740750000000004 3.8740750000000004