condition mean min max ZT0-3 68.43495 68.43495 68.43495 ZT4-7 78.77305000000001 78.77305000000001 78.77305000000001 ZT8-11 19.476300000000002 19.476300000000002 19.476300000000002 ZT12-15 11.053370000000001 11.053370000000001 11.053370000000001 ZT16-19 15.2755 15.2755 15.2755 ZT20-23 27.67015 27.67015 27.67015