condition mean min max ZT0-3 9.895200454000001 9.892608484 9.897792424 ZT4-7 11.1976120635 11.014169183666667 11.381054943333332 ZT8-11 10.569221269166666 10.304750403666667 10.833692134666666 ZT12-15 13.870663480000001 13.807495436666667 13.933831523333334 ZT16-19 13.23867106 12.79415323 13.68318889 ZT20-23 12.1137476475 11.394391305000001 12.83310399