5 Written questions
5 Matching questions
- Approximately how many people live in the US?
- Number of People Living in the US with HIV.
- a Proportion of people with a disease who have a positive test for the disease = true positives/(true positives + false negatives) p. 39
- b the proportion of persons in a defined population at a given point in time having the condition in question
- c a process at any stage of inference tending to produce results that depart systematically from true values.
- d 500,000-1,000,000
- e ...300,000,000
5 Multiple choice questions
- Def: Early detection of existing disease to reduce severity and complications
Ex. Screening for cancer
- 11,700. Of these 11,700 known to have HIV, ~4,500 have AIDS. (This number with AIDS will probably not be asked since the term AIDS is somewhat subjective. The viral load limit that a person must have to be considered suffering from AIDS has been lowered in recent years.)
- variables describing a possible effect p. 5
- "the extent to which repeated measurements of a stable phenomenon by different people and instruments at different times and places get similar results" Other words for this are reproducability and precision. p. 20
5 True/False questions
Pretest Probability → The probability of disease after the test result is known.
Attributable Risk → The absolute difference in the rate of events between the control and the intervention group. ( same as ARR)
Case Control Study → According to answers.com, a case control study is a usually retrospective study in which individuals with and without a condition are examined and past medical history etc. is statistically analyzed for correlation.
Absolute Risk → The probability of an event in a population under study. #new cases over a given period of time / # people in the group
Confounders → Patient characteristics that may affect the results a study it is trying to measure. They can decrease the validity of a study.