Neco Model Questions Vol1 2025 Biology Question 39

Practice objective / multiple choice question 39 from the 2025 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2025 Biology Objective / Multiple Choice Hard Difficulty
Question 39 NECO_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

In a community health survey of 2000 individuals, 400 are smokers and 1600 are non‑smokers. Among the smokers, 80 have developed disease X, while among the non‑smokers, 40 have developed disease X.\n\n(i) Calculate the incidence of disease X in smokers and in non‑smokers.\n(ii) Determine the relative risk (RR) and the odds ratio (OR) for disease X associated with smoking.\n(iii) Compute the attributable risk percent (AR %) among the exposed (smokers).\n(iv) Compute the population attributable risk percent (PAR %) for the whole community.\n(v) Based on these measures, discuss the public‑health implication of smoking for disease X.

Answer Options

A. Incidence smokers = 15 %; non‑smokers = 3 %; RR = 5; OR ≈ 6.2; AR % ≈ 80 %; PAR % ≈ 45 %. Smoking is a moderate risk factor for disease X.
B. Incidence smokers = 25 %; non‑smokers = 2.5 %; RR = 10; OR ≈ 11; AR % ≈ 75 %; PAR % ≈ 55 %. Smoking appears to be a risk factor for disease X.
Correct Answer C. Incidence smokers = 20 %; non‑smokers = 2.5 %; RR = 8; OR ≈ 9.8; AR % ≈ 87.5 %; PAR % ≈ 58.3 %. Smoking is a strong risk factor and contributes to over half of disease X cases in the community.
D. Incidence smokers = 20 %; non‑smokers = 2 %; RR = 10; OR ≈ 12.5; AR % ≈ 90 %; PAR % ≈ 65 %. Smoking is a very strong risk factor and contributes to most disease X cases.
Correct Answer
C
Correct Option:
Incidence smokers = 20 %; non‑smokers = 2.5 %; RR = 8; OR ≈ 9.8; AR % ≈ 87.5 %; PAR % ≈ 58.3 %. Smoking is a strong risk factor and contributes to over half of disease X cases in the community.

About This Question

This is Neco Model Questions Vol1 2025 Biology Question 39. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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