condition mean min max ZT0-3 2.3313125 2.184485 2.47814 ZT4-7 2.514895 2.514895 2.514895 ZT8-11 1.821545 1.821545 1.821545 ZT12-15 0 0 0 ZT16-19 3.381785 3.381785 3.381785 ZT20-23 3.318995 3.318995 3.318995