condition mean min max ZT0-3 87.65555555666667 87.65555555666667 87.65555555666667 ZT4-7 80.08111111 80.08111111 80.08111111 ZT8-11 75.79611111 75.79611111 75.79611111 ZT12-15 83.4611111 83.4611111 83.4611111 ZT16-19 84.32888889 84.32888889 84.32888889 ZT20-23 80.97222221 80.97222221 80.97222221