condition mean min max ZT0-3 10.1585 10.1585 10.1585 ZT4-7 8.842765 8.842765 8.842765 ZT8-11 9.444745000000001 9.444745000000001 9.444745000000001 ZT12-15 12.9457 12.9457 12.9457 ZT16-19 13.23005 13.23005 13.23005 ZT20-23 10.417449999999999 10.417449999999999 10.417449999999999