condition mean min max ZT0-3 38.045787 38.045787 38.045787 ZT4-7 46.231881 46.231881 46.231881 ZT8-11 56.894341499999996 56.894341499999996 56.894341499999996 ZT12-15 63.997612000000004 63.997612000000004 63.997612000000004 ZT16-19 93.473871 93.473871 93.473871 ZT20-23 149.0697155 149.0697155 149.0697155