condition mean min max ZT0-3 84.03111111 84.03111111 84.03111111 ZT4-7 94.11111111 94.11111111 94.11111111 ZT8-11 94.87388887666667 94.87388887666667 94.87388887666667 ZT12-15 95.34777779000001 95.34777779000001 95.34777779000001 ZT16-19 92.73777779 92.73777779 92.73777779 ZT20-23 78.66888889 78.66888889 78.66888889