Lyme disease is an infection caused by bacteria. A test for Lyme disease may be affected by other medications and medical conditions. The testing results are summarized in the table.



Tested positive Tested negative Row Totals

Has Lyme disease 53% 17% 70%

Does not have Lyme disease12% 18% 30%

Column Totals 65% 35% 100%



What percentage of all patients who took the test had a true negative result?

35%

30%

18%

12%