condition mean min max ZT0-3 8.182273 8.182273 8.182273 ZT4-7 10.7061125 10.7061125 10.7061125 ZT8-11 8.7154735 8.7154735 8.7154735 ZT12-15 8.476435500000001 8.476435500000001 8.476435500000001 ZT16-19 8.474716 8.474716 8.474716 ZT20-23 9.873736999999998 9.873736999999998 9.873736999999998