condition mean min max ZT0-3 3.9822725 3.929895 4.03465 ZT4-7 3.1556949999999997 3.1556949999999997 3.1556949999999997 ZT8-11 3.63116 3.63116 3.63116 ZT12-15 0 0 0 ZT16-19 3.56779 3.56779 3.56779 ZT20-23 3.86791 3.86791 3.86791