condition mean min max ZT0-3 17.67815 11.60285 21.438299999999998 ZT4-7 14.66205 14.66205 14.66205 ZT8-11 19.02075 19.02075 19.02075 ZT12-15 25.529025 23.1648 27.893250000000002 ZT16-19 29.0913 29.0913 29.0913 ZT20-23 32.31425 32.31425 32.31425