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Unformatted text preview: Therefore, the disease must be more prevalent in population A As the disease prevalence increase, the true positive numbers increase and then, the positive predictive value increases, too. Therefore, the disease must be more prevalent in population A 5. The best answer is d the audiometric test is more sensitive (sensitivity is greater) and less specific (specificity is smaller) based on the calculation below Sensitivity of physical examination =240/300=0.0800 or 80.0% Specificity of the physical examination =160/200=0.800 or 80% PHYSICAL EXAMINATION Total RESULT PROBLEMS PRESENT PROBLEMS ABSENT Positive 240 40 280 Negative 60 160 220 Total 300 200 500 Sensitivity of audiometric test =270/300 =0.900 or 90.0 % Specificity of audiometric test =140/200 =0.700 or 70.0 % AUDIOMETRIC TEST Total RESULT PROBLEMS PRESENT PROBLEMS ABSENT Positive 270 60 330 Negative 30 140 170 Total 300 200 500...
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- Summer '09