condition mean min max ZT0-3 0.6061078333333334 0.3463105 0.8653310000000001 ZT4-7 1.2571175 1.2571175 1.2571175 ZT8-11 8.328355 8.328355 8.328355 ZT12-15 9.713935 7.89632 11.53155 ZT16-19 2.81571 2.81571 2.81571 ZT20-23 3.079135 3.079135 3.079135