condition mean min max ZT0-3 4.92037 4.92037 4.92037 ZT4-7 4.6640250000000005 4.6640250000000005 4.6640250000000005 ZT8-11 3.6085599999999998 3.6085599999999998 3.6085599999999998 ZT12-15 2.054785 2.054785 2.054785 ZT16-19 4.04669 4.04669 4.04669 ZT20-23 5.03992 5.03992 5.03992