condition mean min max ZT0-3 10.867986666666667 8.864765 13.487 ZT4-7 30.3916 30.3916 30.3916 ZT8-11 51.58955 51.58955 51.58955 ZT12-15 39.290975 33.0105 45.57145 ZT16-19 16.7471 16.7471 16.7471 ZT20-23 14.5439 14.5439 14.5439