How to Answer Doering Cross Magsarili Questions (Complete Guide)

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Original Question

Doering, L. V., Cross, R., Magsarili, M. C., Howitt, L. Y., & Cowan, M. J. (2007). Utility of observer-rated and self-report instruments for detecting major depression in women after cardiac surgery: a pilot study. American journal of critical care, 16(3), 260-269.‏ According to the previous article please answer the following questions: 1.) If you use the cut off of a score of 10 on the BDI to diagnose depression what percent of patients meet the diagnostic criteria? 2.) Which measurement tools detected significant differences between the patients who were depressed and those that were not? 3.) The researchers examined the mean age of the patients who were depressed and those who were not. Write an appropriate null and alternative hypothesis. What would be a good statistical test for this analysis and why? The corresponding p value is 0.25? What do you conclude? 4.) The study concludes that all four of the observer or self-reported instruments have value in detecting depression in women post CABG at the time of discharge. They each have a lower cut off score for screening then diagnosis. The sensitivity and negative predictive value of all the instruments for screening is 100%. Why is this information clinically relevant?

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