# Odds ratio calculations in GWAS paper

Posting here because the reddit thread I made didn't gain any traction.

I'm having a little bit of trouble understanding how the odds ratio was calculated in this table, specifically the OR marked in red:

To my understanding, an odds ratio = $$[(\text{# of cases with exposure}) / (\text{# of controls with exposure})] / [(\text{# of cases without exposure}) / (\text{# of controls without exposure})]$$

In the red-highlighted case, my odds ratio is

$$(0.661 / 0.6580) / [(1-0.661) / (1-0.6580)] = 1.0134$$

which is very off from $0.98$. Also, I know I'm using frequencies rather than absolute counts, but it shouldn't matter because if I were to multiply each frequency by the corresponding population values, all the population values would cancel out.

So, what have I done wrong?

Link to the paper