EVALUATION 2026 TEST PAPER
QUESTIONS AND SOLUTIONS
●● How do you calculate NNT?
Answer: 1/attributable risk
1/(incidence in exposed-incidence in unexposed)
●● Above what level of prevalence does OR no longer approximate RR?
Answer: 10%
●● What is the Y-axis of an ROC graph?
Answer: Sensitivity
The X-axis is 1-specificity
●● How do you calculate sample size?
Answer: N= (z^2 * SD^2)/(expected change^2)
●● What is the best measure of central tendency in nominal data?
Answer: Mode