condition mean min max ZT0-3 3047.3999999999996 3047.3999999999996 3047.3999999999996 ZT4-7 2901.2 2901.2 2901.2 ZT8-11 3183.6499999999996 3183.6499999999996 3183.6499999999996 ZT12-15 3387.3500000000004 3387.3500000000004 3387.3500000000004 ZT16-19 3872.0 3872.0 3872.0 ZT20-23 3399.05 3399.05 3399.05