condition mean min max ZT0-3 5.532578333333333 3.59807 8.11437 ZT4-7 7.59804 7.59804 7.59804 ZT8-11 5.56388 5.56388 5.56388 ZT12-15 6.2359875 6.0514600000000005 6.420515 ZT16-19 3.850485 3.850485 3.850485 ZT20-23 3.157845 3.157845 3.157845