Practice exercise (made-up values, not clinical guidance). A town has 26 500 inhabitants. At the start of a year, 458 of them have a chronic disease. During the year, 326 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 town has 10 500 inhabitants. At the start of a year, 244 of them have a chronic disease. During the year, 199 more people are newly diagnosed (assume nobody moves away or dies). Find the point prevalence P at the start of the year per 1000 inhabitants. Round to one decimal place.
Practice exercise (made-up values, not clinical guidance). A case-control study compares 280 patients with a disease (cases) and 300 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). In a randomised trial, 600 patients received a new treatment and 330 received the control treatment. The table shows how many in each group had a side effect. Find the number needed to harm NNH: how many patients must be treated for one extra patient to have the side effect? Round up to a whole number of patients.
Practice exercise (made-up values, not clinical guidance). A patient has a pre-test probability of 25% for a disease. A test with sensitivity 92% and specificity 64% comes back positive. Find the post-test probability p′ of the disease as a percentage. Round to one decimal place.
Practice exercise (made-up values, not clinical guidance). A patient has a pre-test probability of 5% for a disease. A test with sensitivity 73% and specificity 87% comes back negative. Find the post-test probability p′ of the disease as a percentage. Round to one decimal place.
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