Igcse Model Questions Vol1 2023 Biology Question 3

Practice objective / multiple choice question 3 from the 2023 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 3 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

In a clinical trial of a new vaccine, 1000 participants received the vaccine and 1000 received a placebo. During the study period, 20 vaccinated participants and 80 placebo participants developed the disease. (a) Calculate the absolute risk reduction (ARR) and the relative risk reduction (RRR) provided by the vaccine. (b) Determine the number needed to treat (NNT) to prevent one case of disease, rounding up to the nearest whole person. (c) State whether the vaccine meets the WHO target of at least a 50 % relative risk reduction.

Answer Options

Correct Answer A. ARR = 0.06 (6 %); RRR = 0.75 (75 %); NNT = 17; Meets WHO target: Yes
B. ARR = 0.05 (5 %); RRR = 0.70 (70 %); NNT = 20; Meets WHO target: Yes
C. ARR = 0.04 (4 %); RRR = 0.80 (80 %); NNT = 25; Meets WHO target: Yes
D. ARR = 0.08 (8 %); RRR = 0.60 (60 %); NNT = 13; Meets WHO target: No
Correct Answer
A
Correct Option:
ARR = 0.06 (6 %); RRR = 0.75 (75 %); NNT = 17; Meets WHO target: Yes

About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 3. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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