condition mean min max ZT0-3 2589.3500000000004 2589.3500000000004 2589.3500000000004 ZT4-7 3068.0 3068.0 3068.0 ZT8-11 2706.65 2706.65 2706.65 ZT12-15 2365.8999999999996 2365.8999999999996 2365.8999999999996 ZT16-19 2682.35 2682.35 2682.35 ZT20-23 2760.0 2760.0 2760.0