condition mean min max ZT0-3 41.12876666666667 17.9942 57.9763 ZT4-7 15.838049999999999 15.838049999999999 15.838049999999999 ZT8-11 17.8774 17.8774 17.8774 ZT12-15 22.810925 20.3941 25.22775 ZT16-19 31.6332 31.6332 31.6332 ZT20-23 63.05785 63.05785 63.05785