From: The Paired Availability Design for Historical Controls
Method | Strengths | Weaknesses | ||
---|---|---|---|---|
Randomized controlled trial | 1. | No temporal bias | 1. | Cost and effort |
 | 2. | No selection bias | 2. | Recruitment |
Observational cohort study | 1. | No temporal bias | 1. | Cost of data collection |
 |  |  | 2. | Selection bias if an |
 |  |  |  | important risk factor is |
 |  |  |  | omitted or not |
 |  |  |  | adequately quantified |
Paired availability design | 1. | Lessens selection bias | 1. | Assumptions in Table 2 |