condition mean min max ZT0-3 7761.351572 7761.351572 7761.351572 ZT4-7 7940.0858960000005 7940.0858960000005 7940.0858960000005 ZT8-11 7315.165698 7315.165698 7315.165698 ZT12-15 7351.225985 7351.225985 7351.225985 ZT16-19 6793.712772 6793.712772 6793.712772 ZT20-23 7658.184145 7658.184145 7658.184145