condition mean min max ZT0-3 0.4014781485 0.13861580199999998 0.664340495 ZT4-7 1.3024651205 1.061125374 1.543804867 ZT8-11 2.1307739092499998 1.674739859 2.5868079594999998 ZT12-15 2.5718476595 2.4253758265 2.7183194925 ZT16-19 2.14346867575 2.001893762 2.2850435895 ZT20-23 1.6427706052500002 1.2827713675 2.0027698430000003