condition mean min max ZT0-3 36.806406 36.806406 36.806406 ZT4-7 59.644687 59.644687 59.644687 ZT8-11 77.7883895 77.7883895 77.7883895 ZT12-15 76.2407195 76.2407195 76.2407195 ZT16-19 63.0279215 63.0279215 63.0279215 ZT20-23 61.857087 61.857087 61.857087