Practice exercise (made-up values, not clinical guidance). A town has 23 500 inhabitants. At the start of a year, 501 of them have a chronic disease. During the year, 168 more people are newly diagnosed (assume nobody moves away or dies). Find the cumulative incidence CI over the year per 1000 people at risk. Round to one decimal place.
Practice exercise (made-up values, not clinical guidance). A new test was compared with the reference standard in a study (see the 2 × 2 table). Find the prevalence in the study p as a percentage. Round to one decimal place.
Practice exercise (made-up values, not clinical guidance). A case-control study compares 320 patients with a disease (cases) and 750 people without it (controls). The table shows how many in each group were exposed to a risk factor. Find the odds ratio OR for the exposure. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). A test has a sensitivity of 89% and a specificity of 68%. Find the negative likelihood ratio LR−. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). 10 000 people are screened with a test of sensitivity 83% and specificity 98%. The prevalence of the disease is 13%. How many false-positive results FP are expected?
Practice exercise (made-up values, not clinical guidance). 10 000 people are screened with a test of sensitivity 75% and specificity 88%. The prevalence of the disease is 29%. How many true-positive results TP are expected?
Full step-by-step solutions: practise this topic on examproblems.com.