Group 1: Asymptomatic (n = 52) | Group 2: Pain (n = 56) | Group 3: Mass Effects (n = 5) | P Value | |
---|---|---|---|---|

Age (yr) (mean) (SD)^{a} | 59.3 (9.4) | 51.1 (10.6) | 54.0 (11.7) | .0002^{a} |

Male (No.) (%) | 38 (73.1) | 44 (78.6) | 4 (80.0) | .78^{b} |

Hypertension (No.) (%) | 35 (67.3) | 19 (33.9) | 2 (40.0) | .002^{b} |

Diabetes (No.) (%) | 1 (1.9) | 5 (8.9) | 0 (0.0) | .23^{b} |

Hyperlipidemia (No.) (%) | 7 (13.5) | 14 (25.0) | 2 (40.0) | .18^{b} |

Current smoker (No.) (%) | 24 (46.2) | 26 (46.4) | 1 (20.0) | .51^{b} |

Initial size of aneurysm (mean) (SD)^{a} | 7.7 (3.3) | 7.2 (3.2) | 10.2 (3.5) | .12^{a} |

Aneurysm location (No.) (%) | .70^{b} | |||

Left VA | 18 (34.6) | 25 (44.6) | 1 (20.0) | |

Right VA | 26 (50) | 26 (46.4) | 3 (60.0) | |

Bilateral VA | 5 (9.6) | 5 (8.9) | 1 (20.0) | |

BA | 2 (3.8) | 0 (0.0) | 0 (0.0) | |

Both VA and BA | 1 (1.9) | 0 (0.0) | 0 (0.0) | |

Radiologic changes | <.001^{b} | |||

Improved (No.) (%) | 1 (1.9) | 15 (26.8) | 1 (20.0) | <.001^{c} |

Unchanged (No.) (%) | 50 (96.2) | 38 (67.9) | 3 (60.0) | <.001^{d} |

Enlarged (No.) (%) | 1 (1.9) | 3 (5.4) | 1 (20.0) | .15^{e} |

Clinical course | .048^{f} | |||

Stable (No.) (%) | 51 (98.1) | 55 (98.2) | 4 (80.0) | |

Deteriorated (No.) (%) | 1 (1.9) | 1 (1.8) | 1 (20.0) |

**Note:**—VA indicates vertebral artery; BA, basilar artery.↵a

*P*value was calculated by analysis of variance.↵b

*P*value was calculated by the χ^{2}test.↵c

*P*value was calculated by the χ^{2}test between improved or not improved.↵d

*P*value was calculated by the χ^{2}test between unchanged or changed, either improved or enlarged.↵e

*P*value was calculated by the χ^{2}test between enlarged or not enlarged.↵f

*P*value was calculated by the χ^{2}test between clinically stable or deteriorated.