condition mean min max ZT0-3 31.98662768 28.15839761 35.81485775 ZT4-7 25.082119215000002 22.931617180000003 27.23262125 ZT8-11 26.3796060675 25.79779057 26.961421565000002 ZT12-15 13.34949721725 9.3626754115 17.336319023 ZT16-19 13.3303080365 10.262890683 16.39772539 ZT20-23 25.120580205 22.41861249 27.822547919999998