Evidence-Based Dentistry (EBD) Exam 1 Practice Test 2026 - Free EBD Practice Questions and Study Guide

NNT tells you how many patients must be treated for one additional person to benefit compared with not treating. It is the reciprocal of the absolute risk reduction. If the NNT is 1.5, that means, on average, one additional benefit occurs for every 1.5 patients treated. In practical terms you can think of it as about two patients treated yielding one extra benefit (since 1.5 × 2 ≈ 3, giving roughly two benefits out of three treated). The direct way to state this relationship is that for every 1.5 patients treated, one benefits. Remember that NNT is an average across the study population and depends on the baseline risk and the time period considered.