condition mean min max ZT0-3 14.069125 13.740950000000002 14.3973 ZT4-7 12.2668 12.2668 12.2668 ZT8-11 10.670225 10.670225 10.670225 ZT12-15 0 0 0 ZT16-19 15.5007 15.5007 15.5007 ZT20-23 14.335550000000001 14.335550000000001 14.335550000000001