condition mean min max ZT0-3 0.438564 0.277895 0.5604785 ZT4-7 0.1335795 0.1335795 0.1335795 ZT8-11 1.5160879999999999 1.5160879999999999 1.5160879999999999 ZT12-15 2.292185 2.05786 2.52651 ZT16-19 1.184383 1.184383 1.184383 ZT20-23 1.3413085 1.3413085 1.3413085