Practice exercise (made-up values, not clinical guidance). A town has 37 000 inhabitants. At the start of a year, 967 of them have a chronic disease. During the year, 580 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 negative predictive value NPV as a percentage. Round to one decimal place.
Practice exercise (made-up values, not clinical guidance). A case-control study compares 390 patients with a disease (cases) and 800 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 83% and a specificity of 91%. Find the positive 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 99% and specificity 80%. The prevalence of the disease is 9%. How many positive results n₊ are expected in total?
Practice exercise (made-up values, not clinical guidance). 10 000 people are screened with a test of sensitivity 82% and specificity 93%. The prevalence of the disease is 19%. How many positive results n₊ are expected in total?
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