condition mean min max ZT0-3 249.05 249.05 249.05 ZT4-7 237.9 237.9 237.9 ZT8-11 264.25 264.25 264.25 ZT12-15 240.85000000000002 240.85000000000002 240.85000000000002 ZT16-19 324.0 324.0 324.0 ZT20-23 288.1 288.1 288.1