Outcome | Unmatched cohort | P value*
| Propensity score matched cohort | P value†
| ||||

Age ≥90 years (n=26) | Age <90 years (n=188) | OR (95% CI) | Age ≥90 years (n=23) | Age <90 years (n=66) | OR (95% CI) | |||

Primary
| ||||||||

Death during initial hospitalization | 11 (42.3) | 20 (10.6) | 6.16 (2.49 to 15.24) | <0.001 | 10 (43.5) | 17 (10.4) | 9.33 (2.88 to 47.97) | <0.0001 |

Secondary
| ||||||||

Successful reperfusion‡ | 23 (88.5) | 164 (87.2) | 1.12 (0.31 to 4.02) | 1.00 | 21 (91.3) | 60 (90.9) | 1.20 (0.31 to 4.97) | 1.00 |

Symptomatic ICH | 3 (11.5) | 7 (3.7) | 3.37 (0.82 to 13.96) | 0.11 | 3 (13.0) | 2 (3.0) | 6.00 (1.34 to 55.20) | 0.02 |

Functional independence in patients surviving discharge§ | 4 (26.7) | 53 (31.5) | 0.79 (0.24 to 2.59) | 0.78 | 3 (23.1) | 19 (32.2) | 1.00 (0.23 to 4.35) | 0.75 |

All values are n (%).

*All P values are two-sided Fisher’s exact or chi square test, as appropriate, for the unmatched analysis.

†All P values are McNemar’s test for the matched analysis.

‡Defined as Thrombolysis in Cerebral Infarction (TICI) score of 2B or greater.

§Defined as modified Rankin Scale score of 0–2.

CI, confidence interval; EVT, endovascular thrombectomy; ICH, intracerebral hemorrhage; OR, odds ratio.