condition mean min max ZT0-3 7.8998625 7.024015 8.77571 ZT4-7 5.952915000000001 5.952915000000001 5.952915000000001 ZT8-11 5.8298950000000005 5.8298950000000005 5.8298950000000005 ZT12-15 0 0 0 ZT16-19 8.572125 8.572125 8.572125 ZT20-23 8.875815 8.875815 8.875815