Preventive Medicine & Public Health: PreTest Self-Assessment by Sylvie Ratelle

By Sylvie Ratelle

Now up to date to mirror the USMLE Step 2 examination, with better emphasis on case shows and diagnostic talents. nearly four hundred new medical vignettes with accompanying questions (500 questions in all)--now that includes increased solutions referenced to best textbooks or magazine articles. Reviewed by means of McGraw-Hill's scientific scholar Advisory Committee to make sure simulation of the USMLE test-taking event.

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Extra info for Preventive Medicine & Public Health: PreTest Self-Assessment and Review

Sample text

This makes sense: as a disease becomes more and more unlikely, positive test results should be viewed with increasing skepticism, whereas negative results become increasingly believable. 20. The answer is a. ) Randomization is the use of a predetermined plan of allocation or assignment of subjects to treatment groups such that assignment occurs solely by chance. It is used to eliminate bias on the part of the investigator and the subject in the choice of treatment group. The goal of randomization is to allow chance to distribute unknown sources of biologic variability equally to the treatment and control groups.

SELECT 1 RATE) 65. Number of fetal deaths plus deaths in the first week of life per 1000 total births in 1 year. (SELECT 1 RATE) 66. Number of deaths under the age of 1 year per 1000 live births in 1 year. (SELECT 1 RATE) 67. Number of deaths between the ages of 28 days and 11 months per 1000 live births in 1 year. (SELECT 1 RATE) Internal validity External validity Precision Power Statistical significance 68. A study demonstrates that the risk of cardiovascular disease among physicians can be reduced by aspirin intake.

SELECT 1 PERCENTAGE) 113. Prevalence of chlamydial infection in that community. (SELECT 1 PERCENTAGE) 114. Predictive value of a positive test. (SELECT 1 PERCENTAGE) 115. Predictive value of a negative test. (SELECT 1 PERCENTAGE) Biostatistics and Methods of Epidemiology Items 116-119 For each result or conclusion described below, select the choice that might best explain it. a. b. c. d. e. Ecologic fallacy Type 1 error Type 2 error Selection bias Misclassification bias 116. 11). (SELECT 1 ERROR) 31 119.

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