Neco 2025 Biology Question 35

Practice objective / multiple choice question 35 from the 2025 Neco Biology examination.

Neco 2025 Biology Objective / Multiple Choice Hard Difficulty
Question 35 NECO • 2025 • BIOLOGY • objective

In a cohort study of 10,000 individuals, 2,000 were exposed to a certain airborne pollutant and 8,000 were not. After five years, disease X developed in 150 exposed persons and in 300 unexposed persons.\n\n(i) Compute the incidence proportion in the exposed and unexposed groups.\n(ii) Determine the relative risk (RR) of disease X associated with exposure.\n(iii) Calculate the population attributable fraction (PAF) using the formula \(PAF = \frac{P_e(RR-1)}{P_e(RR-1)+1}\), where \(P_e\) is the proportion of the total population that is exposed. Provide all results to three decimal places where appropriate.

Answer Options

A. Incidence_exposed=0.060, Incidence_unexposed=0.0375, RR=1.600, PAF=0.111 (11.1\%)
B. Incidence_exposed=0.075, Incidence_unexposed=0.0375, RR=2.000, PAF=0.250 (25.0\%)
C. Incidence_exposed=0.075, Incidence_unexposed=0.030, RR=2.500, PAF=0.200 (20.0\%)
Correct Answer D. Incidence_exposed=0.075, Incidence_unexposed=0.0375, RR=2.000, PAF=0.167 (16.7\%)
Correct Answer
D
Correct Option:
Incidence_exposed=0.075, Incidence_unexposed=0.0375, RR=2.000, PAF=0.167 (16.7\%)

About This Question

This is Neco 2025 Biology Question 35. It is one of the objective questions from the 2025 Neco Biology examination.

Difficulty level: Hard .

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