condition mean min max ZT0-3 10.833616666666666 9.09741 12.78355 ZT4-7 8.408015 8.408015 8.408015 ZT8-11 8.680765000000001 8.680765000000001 8.680765000000001 ZT12-15 14.834724999999999 14.24 15.42945 ZT16-19 13.517199999999999 13.517199999999999 13.517199999999999 ZT20-23 14.50715 14.50715 14.50715