condition mean min max ZT0-3 1.5784340000000001 1.5784340000000001 1.5784340000000001 ZT4-7 2.942918 2.942918 2.942918 ZT8-11 2.655179 2.655179 2.655179 ZT12-15 1.43819 1.43819 1.43819 ZT16-19 2.907977 2.907977 2.907977 ZT20-23 2.468775 2.468775 2.468775