condition mean min max ZT0-3 2165.041791 2165.041791 2165.041791 ZT4-7 2498.6655075 2498.6655075 2498.6655075 ZT8-11 2997.935732 2997.935732 2997.935732 ZT12-15 2977.9578325 2977.9578325 2977.9578325 ZT16-19 2778.983119 2778.983119 2778.983119 ZT20-23 2548.2992185000003 2548.2992185000003 2548.2992185000003