1. What is Relative Risk Reduction?

Relative Risk Reduction (RRR) is a measure that shows how much the risk of an outcome is reduced in the intervention group compared to the control group. It's calculated as 1 minus the Relative Risk (RR).

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( RRR \) — Relative Risk Reduction (unitless)
• \( RR \) — Relative Risk (unitless)

Explanation: RRR expresses the proportion of risk reduction attributable to the intervention compared to the control group.

3. Importance of RRR Calculation

Details: RRR is commonly used in clinical trials and epidemiological studies to communicate the effectiveness of treatments or interventions. It helps compare the efficacy of different treatments.

4. Using the Calculator

Tips: Enter the Relative Risk value (must be ≥0). The calculator will compute the Relative Risk Reduction (1 - RR).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between RRR and ARR?
A: RRR is relative (percentage reduction compared to control), while ARR (Absolute Risk Reduction) is the actual difference in risk between groups.

Q2: What does an RRR of 0.5 mean?
A: It means the intervention reduced the risk by 50% compared to the control group.

Q3: Can RRR be negative?
A: Yes, a negative RRR indicates the intervention increased risk compared to control.

Q4: What are limitations of RRR?
A: RRR can be misleading when baseline risks are small, as it doesn't reflect the actual magnitude of benefit.

Q5: When is RRR most useful?
A: When comparing treatments with similar mechanisms or when baseline risks are similar across studies.