condition mean min max ZT0-3 0.0050123847499999995 0.0 0.010024769499999999 ZT4-7 0.5636433625 0.021978862000000002 1.105307863 ZT8-11 5.307215032 3.7396327255 6.8747973385000005 ZT12-15 10.4675626225 9.341647827 11.593477417999999 ZT16-19 6.338840544 6.315452015 6.362229073 ZT20-23 6.4248380045 5.354800911 7.4948750980000005