For a Case-Control Study Designed to Investigate a Possible Association

For a case-control study designed to investigate a possible association between endometriosis and systemic lupus erythematosus (SLE) , 1,040 women with SLE and 1,260 women without SLE are selected.  The investigators inquire about a history of endometriosis in both groups of women.  Among women with SLE, 240 had a history of endometriosis; among women without SLE, 210 had a history of endometriosis.  Which of the following is the estimated odds ratio of endometriosis in women with SLE compared to women without SLE?

A) 0.1
B) 0.7
C) 0.8
D) 1.2
E) 1.5

Correct Answer:

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