condition mean min max ZT0-3 12.650789 12.650789 12.650789 ZT4-7 11.9045545 11.9045545 11.9045545 ZT8-11 11.800584 11.800584 11.800584 ZT12-15 11.5127195 11.5127195 11.5127195 ZT16-19 10.672749 10.672749 10.672749 ZT20-23 10.535985 10.535985 10.535985