condition mean min max ZT0-3 2.2050004999999997 0.9278964999999999 3.90698 ZT4-7 1.130662 1.130662 1.130662 ZT8-11 2.35638 2.35638 2.35638 ZT12-15 1.53111675 0.882565 2.1796685 ZT16-19 4.77287 4.77287 4.77287 ZT20-23 5.02795 5.02795 5.02795