FPE and mFPE rates
| Thrombectomy technique | Number of studies (%) | FPE rate (95% CI) | I2 heterogeneity | |
| Aspiration | 12 (30%) | 29 (22 to 37)% | 90% | P value |
| Stent retriever | 18 (45%) | 34 (28 to 40)% | 92% | 0.17 |
| Combination | 3 (7.5%) | 26 (20 to 32)% | 0% | |
| Not specified | 7 (17.5%) | 27 (22 to 32)% | 87% | |
| Overall | 40 | 28 (26 to 32)% | 90% | |
| mFPE rate (95% CI) | ||||
| Aspiration | 21 (34%) | 48% (40-55) | 93% | P-value |
| Stent retriever | 30 (48%) | 48% (44-53) | 90% | 0.20 |
| Combination | 5 (8%) | 58% (48-68) | 66% | |
| Not specified | 7 (10%) | 34% (28-40) | 89% | |
| Overall | 63 | 45% (42-48) | 92% |
FPE, First pass effect; mFPE, modified first pass effect.