condition mean min max ZT0-3 4.9795 4.9795 4.9795 ZT4-7 3.92141 3.92141 3.92141 ZT8-11 3.139825 3.139825 3.139825 ZT12-15 2.9208800000000004 2.9208800000000004 2.9208800000000004 ZT16-19 3.771105 3.771105 3.771105 ZT20-23 5.734605 5.734605 5.734605