condition mean min max ZT0-3 2435.8999999999996 2435.8999999999996 2435.8999999999996 ZT4-7 3525.3 3525.3 3525.3 ZT8-11 2723.6000000000004 2723.6000000000004 2723.6000000000004 ZT12-15 2890.1 2890.1 2890.1 ZT16-19 2616.4 2616.4 2616.4 ZT20-23 2423.65 2423.65 2423.65