condition mean min max ZT0-3 3538.8999999999996 3538.8999999999996 3538.8999999999996 ZT4-7 2726.0 2726.0 2726.0 ZT8-11 2645.1499999999996 2645.1499999999996 2645.1499999999996 ZT12-15 2492.8500000000004 2492.8500000000004 2492.8500000000004 ZT16-19 3351.05 3351.05 3351.05 ZT20-23 3559.5 3559.5 3559.5