Several attributes define data quality in epidemiology:
1. Accuracy: How close the data is to the true values. 2. Completeness: Whether all necessary data points are captured. 3. Reliability: Consistency of data over time. 4. Timeliness: Availability of data when needed. 5. Relevance: Suitability of the data for the intended purpose. 6. Accessibility: Ease of access to the data for analysis.