condition mean min max ZT0-3 1.543555 1.4534449999999999 1.6336650000000001 ZT4-7 1.062879 1.062879 1.062879 ZT8-11 1.47511 1.47511 1.47511 ZT12-15 0 0 0 ZT16-19 0.894868 0.894868 0.894868 ZT20-23 0.5520485 0.5520485 0.5520485