condition mean min max ZT0-3 1811.4499999999998 1811.4499999999998 1811.4499999999998 ZT4-7 1678.3 1678.3 1678.3 ZT8-11 1607.15 1607.15 1607.15 ZT12-15 1463.75 1463.75 1463.75 ZT16-19 1530.5500000000002 1530.5500000000002 1530.5500000000002 ZT20-23 1749.15 1749.15 1749.15