condition mean min max ZT0-3 0.509529 0.318349 0.700709 ZT4-7 0.7819505 0.7819505 0.7819505 ZT8-11 0.632571 0.632571 0.632571 ZT12-15 0 0 0 ZT16-19 1.2914975 1.2914975 1.2914975 ZT20-23 0.8748144999999999 0.8748144999999999 0.8748144999999999