condition mean min max ZT0-3 24.864 24.864 24.864 ZT4-7 19.7218 19.7218 19.7218 ZT8-11 17.64785 17.64785 17.64785 ZT12-15 15.39705 15.39705 15.39705 ZT16-19 24.9347 24.9347 24.9347 ZT20-23 30.81065 30.81065 30.81065