condition mean min max ZT0-3 25.12755 25.12755 25.12755 ZT4-7 11.295645 11.295645 11.295645 ZT8-11 22.390749999999997 22.390749999999997 22.390749999999997 ZT12-15 31.42125 31.42125 31.42125 ZT16-19 46.484750000000005 46.484750000000005 46.484750000000005 ZT20-23 29.25555 29.25555 29.25555