condition mean min max ZT0-3 984.785018 984.785018 984.785018 ZT4-7 743.4952619999999 743.4952619999999 743.4952619999999 ZT8-11 721.5246795 721.5246795 721.5246795 ZT12-15 765.955869 765.955869 765.955869 ZT16-19 995.8531780000001 995.8531780000001 995.8531780000001 ZT20-23 1160.524053 1160.524053 1160.524053