Univariate analyses of retreatment rates by patient demographics
| Demographics | No retreatment (n=17 183) | Retreatment after 90 days (n=1624) | OR (95% CI) |
| Age (median (IQR) | 57 (48–67) | 56 (47–65) | 0.99 (0.98 to 0.99) |
| Female | 12 075 (71%) | 1253 (79%) | 1.45 (1.29 to 1.65) |
| Race | |||
| White | 9435 (58%) | 941 (61%) | Reference |
| Black | 1964 (12%) | 174 (11%) | 0.89 (0.76 to 1.05) |
| Hispanic | 3428 (21%) | 291 (19%) | 0.86 (0.75 to 0.98) |
| Asian or Pacific Islander | 1005 (6%) | 67 (4%) | 0.68 (0.52 to 0.87) |
| Other | 465 (3%) | 60 (4%) | 1.3 (0.98 to 1.7) |
| Comorbidities | |||
| Dyslipidemia | 3154 (18%) | 260 (16%) | 0.85 (0.74 to 0.97) |
| Smoking | 5670 (33%) | 554 (34%) | 1.05 (0.94 to 1.16) |
| Diabetes | 2333 (14%) | 181 (11%) | 0.81 (0.69 to 0.95) |
| Hypertension | 10 944 (64%) | 975 (60%) | 0.86 (0.78 to 0.96) |
| Renal failure | 492 (3%) | 31 (2%) | 0.67 (0.46 to 0.97) |
| Charlson Index (median (IQR) | 2 (1–3) | 2 (1–3) | 0.99 (0.97 to 1.01) |
| Index treatment | |||
| SC | 7048 (41%) | 279 (17%) | Reference |
| ET | 10 135 (59%) | 1345 (83%) | 3.25 (2.85 to 3.71) |
| Ruptured vs unruptured | |||
| Unruptured aneurysm | 8071 (47%) | 785 (48%) | Reference |
| Ruptured aneurysm | 9112 (53%) | 839 (52%) | 0.97 (0.88 to 1.07) |
| State | |||
| California | 8659 (50%) | 725 (45%) | Reference |
| Florida | 8524 (50%) | 899 (55%) | 1.24 (1.12 to 1.37) |
| Year | |||
| 2005 | 1905 (11%) | 211 (13%) | Reference |
| 2006 | 1946 (11%) | 206 (13%) | 0.95 (0.78 to 1.16) |
| 2007 | 1957 (11%) | 222 (14%) | 1.01 (0.83 to 1.23) |
| 2008 | 1991 (12%) | 214 (13%) | 0.96 (0.78 to 1.17) |
| 2009 | 2122 (12%) | 215 (13%) | 0.90 (0.74 to 1.10) |
| 2010 | 2204 (13%) | 187 (12%) | 0.75 (0.61 to 0.92) |
| 2011 | 2283 (13%) | 147 (9%) | 0.58 (0.46 to 0.72) |
| 2012* | 892 (5%) | 93 (6%) | 0.92 (0.71 to 1.19) |
| 2013* | 914 (5%) | 99 (6%) | 0.96 (0.75 to 1.23) |
| 2014* | 969 (6%) | 30 (2%) | 0.28 (0.19 to 0.41) |
*Data available only for Florida.
ET, endovascular treatment; SC, surgical clipping. Data are presented as n(%) or median (interquartile range) unless otherwise specified.