condition mean min max ZT0-3 0.7993413333333333 0.7104695 0.867051 ZT4-7 1.16765 1.16765 1.16765 ZT8-11 1.439735 1.439735 1.439735 ZT12-15 1.3150475 1.27518 1.354915 ZT16-19 2.105735 2.105735 2.105735 ZT20-23 1.617745 1.617745 1.617745