condition mean min max ZT0-3 2.3606295 0.6376385 3.2315 ZT4-7 0.5304755 0.5304755 0.5304755 ZT8-11 0.862914 0.862914 0.862914 ZT12-15 2.01552 1.74113 2.28991 ZT16-19 2.672465 2.672465 2.672465 ZT20-23 5.494785 5.494785 5.494785