condition mean min max ZT0-3 5.8828 5.8828 5.8828 ZT4-7 5.31765 5.31765 5.31765 ZT8-11 5.1322849999999995 5.1322849999999995 5.1322849999999995 ZT12-15 3.25594 3.25594 3.25594 ZT16-19 7.40774 7.40774 7.40774 ZT20-23 4.941845 4.941845 4.941845