condition mean min max ZT0-3 1.55403 1.55403 1.55403 ZT4-7 1.195065 1.195065 1.195065 ZT8-11 1.09654 1.09654 1.09654 ZT12-15 0.960616 0.960616 0.960616 ZT16-19 1.242445 1.242445 1.242445 ZT20-23 1.4356499999999999 1.4356499999999999 1.4356499999999999