condition mean min max ZT0-3 0.8043336666666667 0.7210540000000001 0.880727 ZT4-7 0.4118425 0.4118425 0.4118425 ZT8-11 0.49827 0.49827 0.49827 ZT12-15 0.500975 0.4863815 0.5155685 ZT16-19 0.4770495 0.4770495 0.4770495 ZT20-23 0.4513795 0.4513795 0.4513795