condition mean min max ZT0-3 0.5519666666666667 0.4854085 0.585727 ZT4-7 0.5551565 0.5551565 0.5551565 ZT8-11 0.931362 0.931362 0.931362 ZT12-15 1.7331775 1.68529 1.781065 ZT16-19 1.24859 1.24859 1.24859 ZT20-23 1.813825 1.813825 1.813825