1. What is Proportion of Days Covered (PDC)?

Definition: PDC is a metric that calculates the fraction of days covered relative to total days in a period.

Purpose: It helps in medication adherence studies, project management, and any scenario where coverage over time needs to be measured.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( PDC \) — Proportion of days covered (dimensionless)
• \( DC \) — Days covered (days)
• \( T \) — Total days (days)

Explanation: The days covered is divided by total days to get the proportion, which ranges from 0 to 1.

3. Importance of PDC Calculation

Details: PDC is crucial for understanding coverage rates, adherence percentages, and time-based performance metrics.

4. Using the Calculator

Tips: Enter the days covered and total days. Both values must be > 0, and days covered cannot exceed total days.

5. Frequently Asked Questions (FAQ)

Q1: What does a PDC of 0.75 mean?
A: It means 75% of the days in the period were covered (e.g., 75 days covered out of 100 total days).

Q2: Can PDC be greater than 1?
A: No, PDC ranges from 0 to 1. If days covered exceeds total days, check your inputs.

Q3: What's a good PDC value?
A: In medication adherence, PDC ≥ 0.8 (80%) is typically considered good adherence.

Q4: How is this different from percentage?
A: It's essentially the same as percentage but expressed as a decimal (multiply by 100 to get percentage).

Q5: What time units can I use?
A: Any consistent time unit can be used (days, weeks, etc.) as long as both inputs use the same unit.