condition mean min max ZT0-3 70.313647 70.313647 70.313647 ZT4-7 43.946957 43.946957 43.946957 ZT8-11 35.318241 35.318241 35.318241 ZT12-15 27.532035 27.532035 27.532035 ZT16-19 20.236704500000002 20.236704500000002 20.236704500000002 ZT20-23 27.2634025 27.2634025 27.2634025