condition mean min max ZT0-3 19.77225 19.77225 19.77225 ZT4-7 17.10615 17.10615 17.10615 ZT8-11 9.796265 9.796265 9.796265 ZT12-15 14.257005 14.257005 14.257005 ZT16-19 16.5547 16.5547 16.5547 ZT20-23 25.350450000000002 25.350450000000002 25.350450000000002