Igcse Model Questions Vol1 2021 Biology Question 19

Practice objective / multiple choice question 19 from the 2021 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2021 Biology Objective / Multiple Choice Hard Difficulty
Question 19 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • objective

In a randomized clinical trial, 150 patients receive a new drug and 150 receive a placebo. After six months, 45 patients in the drug group show improvement, whereas 30 patients in the placebo group improve. (a) Calculate the absolute risk reduction (ARR), the relative risk reduction (RRR) and the number needed to treat (NNT). (b) Briefly interpret these results for clinical practice.

Answer Options

A. ARR = 10 % (0.10); RRR = 40 % (0.40); NNT = 12; the drug gives one extra improvement for every twelve patients treated versus placebo.
B. ARR = 5 % (0.05); RRR = 25 % (0.25); NNT = 20; the drug gives one extra improvement for every twenty patients treated versus placebo.
C. ARR = 15 % (0.15); RRR = 75 % (0.75); NNT = 7; the drug gives one extra improvement for every seven patients treated versus placebo.
Correct Answer D. ARR = 10 % (0.10); RRR = 50 % (0.50); NNT = 10; the drug gives one extra improvement for every ten patients treated versus placebo.
Correct Answer
D
Correct Option:
ARR = 10 % (0.10); RRR = 50 % (0.50); NNT = 10; the drug gives one extra improvement for every ten patients treated versus placebo.

About This Question

This is Igcse Model Questions Vol1 2021 Biology Question 19. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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