condition mean min max ZT0-3 1.2068891666666668 0.74769 1.4826885 ZT4-7 0.9994755 0.9994755 0.9994755 ZT8-11 1.120946 1.120946 1.120946 ZT12-15 1.421691 1.42014 1.4232420000000001 ZT16-19 0.745425 0.745425 0.745425 ZT20-23 0.7600585 0.7600585 0.7600585