What percentage of urinary tract infections could have been avoided?

In a study on the relationship between oral contraceptives (OCs) and urinary tract infections 500 w Show more In a study on the relationship between oral contraceptives (OCs) and urinary tract infections 500 women who use OC and 3000 women who do not use OCs were monitored over a period of three years. Table: New cases of urinary tract infections Year Uses OCs Do not use OCs 1 15 35 2 30 70 3 20 33 a) What is the odds ratio as it relates to urinary tract infections? b) What percentage of urinary tract infections could have been avoided? c) What is the relative risk linked to the use of OCs and urinary tract infections? Show less

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