The column ‘normal’ (e.g C) is the variant associated with normal enzyme activity, while the column ‘risk’ (A) is the variant associated with reduced enzyme activity. ‘Geno’ refers to your genotype.
If you carry 2 risk variants (e.g AA) for that SNP, then it is marked in red.
If you carry 1 risk variant (e.g AC) for that SNP, then it is marked in yellow.
If you carry 2 normal variants (e.g CC) for that SNP, then it is marked in white