condition mean min max ZT0-3 1650.0 1650.0 1650.0 ZT4-7 1033.4 1033.4 1033.4 ZT8-11 1186.8000000000002 1186.8000000000002 1186.8000000000002 ZT12-15 1130.8000000000002 1130.8000000000002 1130.8000000000002 ZT16-19 1568.8000000000002 1568.8000000000002 1568.8000000000002 ZT20-23 1965.65 1965.65 1965.65