condition mean min max ZT0-3 6.23135 2.8214050000000004 9.641295 ZT4-7 1.416848 1.416848 1.416848 ZT8-11 3.660985 3.660985 3.660985 ZT12-15 0 0 0 ZT16-19 3.880275 3.880275 3.880275 ZT20-23 0.6234005 0.6234005 0.6234005