condition mean min max ZT0-3 24.436349999999997 22.98305 25.88965 ZT4-7 17.6765 17.6765 17.6765 ZT8-11 12.06692 12.06692 12.06692 ZT12-15 0 0 0 ZT16-19 17.295 17.295 17.295 ZT20-23 20.335250000000002 20.335250000000002 20.335250000000002