condition mean min max ZT0-3 18.44837393625 13.6478950625 23.24885281 ZT4-7 9.0066332275 8.0656820335 9.9475844215 ZT8-11 8.046722778 7.5748076055 8.5186379505 ZT12-15 12.17484942125 7.7515258325000005 16.59817301 ZT16-19 19.14300709 13.79356964 24.49244454 ZT20-23 43.5333769675 37.588302645 49.478451289999995