condition mean min max ZT0-3 1.9993924972733332 0.24268749182000002 3.418285 ZT4-7 2.32399 2.32399 2.32399 ZT8-11 0.947501553695 0.947501553695 0.947501553695 ZT12-15 3.2287475 2.91543 3.542065 ZT16-19 2.17485 2.17485 2.17485 ZT20-23 1.1805993052 1.1805993052 1.1805993052