condition mean min max ZT0-3 2231.05 2231.05 2231.05 ZT4-7 2907.0 2907.0 2907.0 ZT8-11 1798.75 1798.75 1798.75 ZT12-15 616.85 616.85 616.85 ZT16-19 181.05 181.05 181.05 ZT20-23 557.3000000000001 557.3000000000001 557.3000000000001