condition mean min max ZT0-3 11.93765 11.93765 11.93765 ZT4-7 9.755030000000001 9.755030000000001 9.755030000000001 ZT8-11 9.105795 9.105795 9.105795 ZT12-15 8.61379 8.61379 8.61379 ZT16-19 13.978449999999999 13.978449999999999 13.978449999999999 ZT20-23 8.525055 8.525055 8.525055