condition mean min max ZT0-3 28.94533 28.94533 28.94533 ZT4-7 16.588357000000002 16.588357000000002 16.588357000000002 ZT8-11 13.440128 13.440128 13.440128 ZT12-15 12.9460485 12.9460485 12.9460485 ZT16-19 8.9427775 8.9427775 8.9427775 ZT20-23 9.43882 9.43882 9.43882