condition mean min max ZT0-3 7.866467500000001 7.43437 8.298565 ZT4-7 3.26227 3.26227 3.26227 ZT8-11 2.41312 2.41312 2.41312 ZT12-15 0 0 0 ZT16-19 5.3520199999999996 5.3520199999999996 5.3520199999999996 ZT20-23 4.74704 4.74704 4.74704