condition mean min max ZT0-3 2377.6 2377.6 2377.6 ZT4-7 3345.5 3345.5 3345.5 ZT8-11 3213.95 3213.95 3213.95 ZT12-15 1897.65 1897.65 1897.65 ZT16-19 1301.35 1301.35 1301.35 ZT20-23 1667.05 1667.05 1667.05