condition mean min max ZT0-3 0.02045715 0.02045715 0.02045715 ZT4-7 0.0083696 0.0083696 0.0083696 ZT8-11 0.006834 0.006834 0.006834 ZT12-15 0.00834645 0.00834645 0.00834645 ZT16-19 0.043982099999999996 0.043982099999999996 0.043982099999999996 ZT20-23 0.0145589 0.0145589 0.0145589