condition mean min max ZT0-3 1689.3000000000002 1689.3000000000002 1689.3000000000002 ZT4-7 1552.4 1552.4 1552.4 ZT8-11 1557.5500000000002 1557.5500000000002 1557.5500000000002 ZT12-15 1656.65 1656.65 1656.65 ZT16-19 1818.85 1818.85 1818.85 ZT20-23 1954.75 1954.75 1954.75