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Table of estimate of trial enrollment rate (with 95% confidence interval) and number of trials by degree of intervention difference and author nationality.
| Nationality |
|||
|---|---|---|---|
| USA and Canada | Other | ||
| Degree of difference between interventions | Operative vs. non-operative | 49.2% (32.1–66.4%) | 86.4% (81.7–91.2%) |
| 13 trials | 41 trials | ||
| Other | 83.5% (79.3–87.8%) | 92.6% (91.5–93.7%) | |
| 70 trials | 269 trials | ||
