condition mean min max ZT0-3 12.22315 12.03735 12.40895 ZT4-7 10.10835 10.10835 10.10835 ZT8-11 9.540215 9.540215 9.540215 ZT12-15 0 0 0 ZT16-19 13.590399999999999 13.590399999999999 13.590399999999999 ZT20-23 13.6841 13.6841 13.6841