condition mean min max ZT0-3 1.3463699999999998 1.3463699999999998 1.3463699999999998 ZT4-7 0.494825 0.494825 0.494825 ZT8-11 1.340765 1.340765 1.340765 ZT12-15 2.04895 2.04895 2.04895 ZT16-19 3.9576599999999997 3.9576599999999997 3.9576599999999997 ZT20-23 1.687235 1.687235 1.687235