Table 1 Characteristics of included registry-based comparative studies
N = 150 | |
|---|---|
Population size | |
≤ 500 | 10 |
501—1 500 | 22 |
1 501—5 000 | 29 |
5 001—50 000 | 59 |
> 50 000 | 24 |
Not reported | 6 |
Intervention | |
Surgical procedure | 60 |
Medical device | 57 |
Drug | 27 |
Other | 6 |
Method of analysis | |
Cox regression | 79 |
Logistic regression | 18 |
Chi-square test | 14 |
Log-rank test | 8 |
Instrumental variable analysis | 2 |
T-test | 2 |
Other | 11 |
Not reported | 16 |
Outcome measures | |
Revision rate | 37 |
Cardiovascular events | 30 |
Mortality | 37 |
Composite adverse events | 18 |
Other health outcomes | 15 |
Other complications | 6 |
Other | 7 |
Type of effect estimate | |
Hazard ratio | 76 |
Odds ratio | 29 |
Difference in means | 21 |
Risk ratio | 15 |
Other | 2 |
Not reported | 7 |
Pre-Registration or published protocol | 4 |