condition mean min max ZT0-3 1495.046916 1495.046916 1495.046916 ZT4-7 1662.403045 1662.403045 1662.403045 ZT8-11 1381.235067 1381.235067 1381.235067 ZT12-15 1296.142363 1296.142363 1296.142363 ZT16-19 1516.2512875 1516.2512875 1516.2512875 ZT20-23 1890.7527145 1890.7527145 1890.7527145