Practice exercise (made-up values, not clinical guidance). A town has 16 000 inhabitants. At the start of a year, 296 of them have a chronic disease. During the year, 279 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 new test was compared with the reference standard in a study (see the 2 × 2 table). Find the specificity Sp as a percentage. 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 likelihood ratio LR−. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). A test has a sensitivity of 84% and a specificity of 88%. Find the positive likelihood ratio LR+. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). A treatment reduces the risk of an event by 22% in relative terms (RRR = 22%). In a patient group the risk without treatment (CER) is 36% over five years. Find the number needed to treat NNT for five years to prevent one event. Round up to a whole number of patients.
Practice exercise (made-up values, not clinical guidance). A treatment reduces the risk of an event by 39% in relative terms (RRR = 39%). In a patient group the risk without treatment (CER) is 8% over five years. Find the number needed to treat NNT for five years to prevent one event. Round up to a whole number of patients.
Full step-by-step solutions: practise this topic on examproblems.com.