condition mean min max ZT0-3 11.25350690525 4.5595235705 17.94749024 ZT4-7 7.82038164825 5.8661658765 9.77459742 ZT8-11 7.628423980999999 6.6377697934999995 8.6190781685 ZT12-15 3.8430566457500004 2.8940229000000004 4.7920903915 ZT16-19 3.2203963234999997 3.0348276399999996 3.405965007 ZT20-23 1.3972695047500001 0.8053192345 1.989219775