A study of Florida’s past two presidential elections finds that mail ballots were 10 times more likely to be rejected than votes cast at early voting sites or on election day.

The study also found that mail ballots cast by youngest voters, blacks and Hispanics were much more likely to be rejected than mail ballots cast by white voters, and that those voters are less likely to cure problems with their ballots when notified by election supervisors than other voters.

The study also shows that rejection rates vary widely across the state.

Read more at our news partner, the Miami Herald.