condition mean min max ZT0-3 1.01973825 0.6881005 1.3513760000000001 ZT4-7 5.335425 5.335425 5.335425 ZT8-11 3.8546 3.8546 3.8546 ZT12-15 0 0 0 ZT16-19 2.904925 2.904925 2.904925 ZT20-23 2.78621 2.78621 2.78621