condition mean min max ZT0-3 3.6684824999999996 3.3797099999999998 3.957255 ZT4-7 11.60785 11.60785 11.60785 ZT8-11 5.39522 5.39522 5.39522 ZT12-15 0 0 0 ZT16-19 5.278895 5.278895 5.278895 ZT20-23 4.6919900000000005 4.6919900000000005 4.6919900000000005