condition mean min max ZT0-3 3291.7 3291.7 3291.7 ZT4-7 3199.1 3199.1 3199.1 ZT8-11 2898.1000000000004 2898.1000000000004 2898.1000000000004 ZT12-15 2685.45 2685.45 2685.45 ZT16-19 3420.0 3420.0 3420.0 ZT20-23 3377.2 3377.2 3377.2