condition mean min max ZT0-3 7.2102025 6.2009799999999995 8.219425000000001 ZT4-7 6.2023399999999995 6.2023399999999995 6.2023399999999995 ZT8-11 4.44316 4.44316 4.44316 ZT12-15 0 0 0 ZT16-19 6.42814 6.42814 6.42814 ZT20-23 6.45992 6.45992 6.45992