condition mean min max ZT0-3 9.532076 9.532076 9.532076 ZT4-7 11.0456915 11.0456915 11.0456915 ZT8-11 11.133168 11.133168 11.133168 ZT12-15 9.8747085 9.8747085 9.8747085 ZT16-19 11.8106165 11.8106165 11.8106165 ZT20-23 10.489315000000001 10.489315000000001 10.489315000000001