condition mean min max ZT0-3 54.882932835 38.30893243 71.45693324 ZT4-7 75.53460981 70.12100558 80.94821404 ZT8-11 75.847345235 75.61843572333333 76.07625474666666 ZT12-15 89.29699942166667 86.64983924 91.94415960333333 ZT16-19 94.099309275 92.77437906666667 95.42423948333332 ZT20-23 85.30196337000001 81.30949194666667 89.29443479333334