condition mean min max ZT0-3 1.709722922 1.016024333 2.4034215110000003 ZT4-7 6.97907045175 5.9925005865 7.965640317 ZT8-11 8.7843457775 8.051425246500001 9.5172663085 ZT12-15 32.87609569625 28.287752062499997 37.46443933 ZT16-19 30.0356724875 26.435170895 33.63617408 ZT20-23 20.748295244999998 19.667224079999997 21.82936641