condition mean min max ZT0-3 2296.35124075 2207.7852325000003 2384.9172489999996 ZT4-7 1849.054555 1559.5483454999999 2138.5607645 ZT8-11 1727.8168065 1711.182276 1744.451337 ZT12-15 3101.955261 2810.30879 3393.601732 ZT16-19 4166.568562 4099.6237445 4233.5133795 ZT20-23 3402.1510305 3180.6186470000002 3623.683414