If efficacy is 0.8 and compliance is 1.0, what is the approximate effectiveness?

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Study for the ACVPM Epidemiology and Biostatistics Exam. Prepare with flashcards and multiple choice questions, with hints and explanations for each. Be exam-ready!

Multiple Choice

If efficacy is 0.8 and compliance is 1.0, what is the approximate effectiveness?

Explanation:
Effectiveness in real-world use is often approximated by multiplying how well the intervention works under ideal conditions (efficacy) by how well people adhere to the regimen (compliance). With efficacy 0.8 and perfect compliance (1.0), the product is 0.8 × 1.0 = 0.8. So the approximate effectiveness is 0.8 (80%). Since adherence is perfect, there’s no extra drop from real-world use; the effectiveness equals the efficacy. If adherence were less than 1, effectiveness would fall below 0.8 proportional to the level of compliance.

Effectiveness in real-world use is often approximated by multiplying how well the intervention works under ideal conditions (efficacy) by how well people adhere to the regimen (compliance). With efficacy 0.8 and perfect compliance (1.0), the product is 0.8 × 1.0 = 0.8. So the approximate effectiveness is 0.8 (80%). Since adherence is perfect, there’s no extra drop from real-world use; the effectiveness equals the efficacy. If adherence were less than 1, effectiveness would fall below 0.8 proportional to the level of compliance.

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