condition mean min max ZT0-3 19.420007 19.420007 19.420007 ZT4-7 10.7983495 10.7983495 10.7983495 ZT8-11 13.2887065 13.2887065 13.2887065 ZT12-15 11.039387000000001 11.039387000000001 11.039387000000001 ZT16-19 11.423160500000002 11.423160500000002 11.423160500000002 ZT20-23 10.5104765 10.5104765 10.5104765