condition mean min max ZT0-3 0.7999533333333333 0.7395995 0.8885755 ZT4-7 0.5322865 0.5322865 0.5322865 ZT8-11 0.8731504999999999 0.8731504999999999 0.8731504999999999 ZT12-15 2.0370524999999997 1.885895 2.1882099999999998 ZT16-19 1.81056 1.81056 1.81056 ZT20-23 1.9849350000000001 1.9849350000000001 1.9849350000000001