Effectiveness vs. Efficacy vs. Efficiency – Differences

With so much focus on the results of COVID-19 vaccines, it leads people to ask: what's the difference between "effectiveness, "efficacy," and "efficiency"?

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Illustrative figure that showcases the differences between efficiency

What Is The Difference Between Efficiency and Efficacy?

What Is The Difference Between Efficiency and Efficacy?

Difference Between Efficiency and Effectiveness (with Comparison Chart) - Key Differences

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The concept of efficiency and effectiveness

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DIFFERENCE BETWEEN EFFICIENCY AND EFFECTIVENESS

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Effectiveness vs. Efficiency: What's the Difference?