condition mean min max ZT0-3 10.2104625 8.31458 12.106345000000001 ZT4-7 29.529649999999997 29.529649999999997 29.529649999999997 ZT8-11 32.84085 32.84085 32.84085 ZT12-15 0 0 0 ZT16-19 21.81135 21.81135 21.81135 ZT20-23 19.17125 19.17125 19.17125