condition mean min max ZT0-3 1.2219011666666666 0.5913435 1.65516 ZT4-7 2.737595 2.737595 2.737595 ZT8-11 2.378825 2.378825 2.378825 ZT12-15 1.4257382499999998 0.6724865 2.1789899999999998 ZT16-19 0.47885350000000004 0.47885350000000004 0.47885350000000004 ZT20-23 0.751072 0.751072 0.751072