Logistic Regression Model Assignment

FINAL EXAM REVIEW: ANSWER KEY

• The following results are from a prospective study that considered predictors of mammography use in women. The investigators used logistic regression to analyze their data.
  Results of a logistic regression predicting annual mammography use:
  
  1. What is the odds ratio for getting a mammogram for every 10-year increase in age? ?.04*10 = 0.67
  2. What is(are) the odds ratio(s) for every 1-unit increase in worry?
     Among women with no family history of breast cancer, the odds ratio for a 1-unit increase in worry is:
     Odd(worry=x+1)/odd(worry=x)=e^-0.4(x+1)/e^-0.4(x)=e^-0.4=0.96
     Among women with a family history of breast cancer, the odds ratio for worry a 1-unit increase in worry is:
     Odd(worry=x+1)/odd(worry=x)=e^-0.4(x+1)*e^-0.5(x+1)/e^-0.4(x)*e^-.05(x)=e^-.04-.05=0.91
  3. What is(are) the odds ratio(s) for having a positive family history?

odd(worry=x)/odd(worry=x)=e.14(1)*e^?.04(x)*e^?.05(x)/e^.14(0)*e^?.04(x)=e^.14(1)*e^?.05(x)/1=e^.14(1)*e^?.05(x)

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