condition mean min max ZT0-3 3182.3500000000004 3182.3500000000004 3182.3500000000004 ZT4-7 4351.0 4351.0 4351.0 ZT8-11 3621.8999999999996 3621.8999999999996 3621.8999999999996 ZT12-15 2188.45 2188.45 2188.45 ZT16-19 1341.65 1341.65 1341.65 ZT20-23 1615.4 1615.4 1615.4