condition mean min max ZT0-3 53.05111111 53.05111111 53.05111111 ZT4-7 44.236111109999996 44.236111109999996 44.236111109999996 ZT8-11 50.71611111 50.71611111 50.71611111 ZT12-15 71.20555555666667 71.20555555666667 71.20555555666667 ZT16-19 97.39777775666667 97.39777775666667 97.39777775666667 ZT20-23 62.52888889 62.52888889 62.52888889