condition mean min max ZT0-3 2.8245576312500003 2.635725462 3.0133898005 ZT4-7 3.8133164875 3.401704729 4.224928246 ZT8-11 4.38965156175 4.3801644385 4.3991386850000005 ZT12-15 4.075425556500001 4.0222122765 4.1286388365 ZT16-19 5.588981961 4.418833375 6.759130547000001 ZT20-23 10.8970241685 9.273275932 12.520772405