condition mean min max ZT0-3 1512.8000000000002 1512.8000000000002 1512.8000000000002 ZT4-7 1971.5 1971.5 1971.5 ZT8-11 1684.45 1684.45 1684.45 ZT12-15 1651.25 1651.25 1651.25 ZT16-19 1769.8000000000002 1769.8000000000002 1769.8000000000002 ZT20-23 1688.65 1688.65 1688.65