condition mean min max ZT0-3 12.482825 10.991299999999999 13.974350000000001 ZT4-7 9.05982 9.05982 9.05982 ZT8-11 9.42294 9.42294 9.42294 ZT12-15 0 0 0 ZT16-19 9.901765000000001 9.901765000000001 9.901765000000001 ZT20-23 10.61595 10.61595 10.61595