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In a study of the effect of cranberry capsules on urinary tract infection (UTI) in elderly women in nursing homes, one group of women were randomly assigned to receive capsules with cranberry and the...

  1. In a study of the effect of cranberry capsules on urinary tract infection (UTI) in elderly women in nursing homes, one group of women were randomly assigned to receive capsules with cranberry and the other group were given placebo capsules. These are the results in the 12th month: Please include all formulas used to get full credit

D+ (UTI)

D- (No UTI)

Total

Treatment

12

32

44

Control

9

37

46

  1. What is the risk of disease (UTI) for treated patients? For control patients? What is the risk ratio?
  2. What are the odds of UTI for treated patients? For control patients? What is the odds ratio?
  3. Under what circumstances does the odds ratio approximate the risk ratio?
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Answer #1

oution m qiven 32 IL Sease (UT isease (UTi) Risk rato 9 40 12 a/46 12 X46 552 396 Ri«k srat» : 1-3939Coabuol greup od odds ralo J odds n Conhuol group 9/33 19 37 2. (12x3) P, nt gvoup P2 gHap3 Comtuol grup L-P -P Pz Nou g roups

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