condition mean min max ZT0-3 0.7475572500000001 0.6305095000000001 0.864605 ZT4-7 1.458125 1.458125 1.458125 ZT8-11 2.47653 2.47653 2.47653 ZT12-15 0 0 0 ZT16-19 2.47906 2.47906 2.47906 ZT20-23 2.36785 2.36785 2.36785