condition mean min max ZT0-3 22.691638493333336 21.069910896666666 24.313366090000002 ZT4-7 13.376383715 12.43080973 14.3219577 ZT8-11 14.130295539999999 12.8350382 15.42555288 ZT12-15 17.2544356965 14.930307893 19.578563499999998 ZT16-19 16.954230879999997 16.61698297 17.29147879 ZT20-23 15.581086724999999 14.81711591 16.34505754