condition mean min max ZT0-3 1.0433016666666666 0.502114 1.94953 ZT4-7 0.6973465 0.6973465 0.6973465 ZT8-11 0.386585 0.386585 0.386585 ZT12-15 1.846194 0.794673 2.897715 ZT16-19 1.841635 1.841635 1.841635 ZT20-23 0.6779765 0.6779765 0.6779765