condition mean min max ZT0-3 13.59195 13.21495 13.96895 ZT4-7 10.05922 10.05922 10.05922 ZT8-11 12.67555 12.67555 12.67555 ZT12-15 0 0 0 ZT16-19 24.354550000000003 24.354550000000003 24.354550000000003 ZT20-23 17.594549999999998 17.594549999999998 17.594549999999998