condition mean min max ZT0-3 130.25 130.25 130.25 ZT4-7 23.9 23.9 23.9 ZT8-11 97.0 97.0 97.0 ZT12-15 231.3 231.3 231.3 ZT16-19 163.95000000000002 163.95000000000002 163.95000000000002 ZT20-23 58.0 58.0 58.0