condition mean min max ZT0-3 11.09966 9.28202 12.917300000000001 ZT4-7 8.052764999999999 8.052764999999999 8.052764999999999 ZT8-11 5.988855 5.988855 5.988855 ZT12-15 0 0 0 ZT16-19 7.5011399999999995 7.5011399999999995 7.5011399999999995 ZT20-23 8.58157 8.58157 8.58157