In-hospital mortality according to patient and hospital factors, NIS 1998–2007
| Factors | Ruptured aneurysms (20 134) | Unruptured aneurysms (n=14 765) | ||
| No. of events (%) | OR* (95% CI) | No. of events(%) | OR* (95% CI) | |
| Age | ||||
| Mean±SD | 59.0 (15.1) versus 52.9 (14.1)† | 1.03 (1.02 to 1.03) | 58.1 (14.4) versus 52.6 (13.8)† | 1.05 (1.03 to 1.07) |
| Sex | ||||
| Female | 1976 (14.3) | 1 | 125 (1.17) | 1 |
| Male | 789 (12.7) | 0.88 (0.79 to 0.99) | 52 (1.30) | 1.24 (0.87 to 1.77) |
| Race | ||||
| White | 1315 (14.5) | 1 | 80 (1.05) | 1 |
| Black | 261 (11.5) | 0.83 (0.71 to 1.00) | 17 (1.68) | 1.63 (0.91 to 2.91) |
| Other (Hispanic, Asian, or Native American) | 294 (13.2) | 0.93 (0.80 to 1.08) | 15 (1.33) | 1.43 (1.21 to 1.70) |
| Income quartile | ||||
| <25 000 | 504 (14.0) | 1.14 (0.97 to 1.34) | 36 (1.44) | 1.25 (0.68 to 2.31) |
| 25 000–34 999 | 698 (14.0) | 1.10 (0.95 to 1.27) | 42 (1.14) | 1.11 (0.63 to 1.97) |
| 35 000–44 999 | 704 (13.8) | 1.08 (0.94 to 1.25) | 53 (1.33) | 1.18 (0.68 to 2.04) |
| ≥45 000 | 761 (13.3) | 1 | 42 (0.99) | 1 |
| Healthcare coverage | ||||
| Private insurance | 1163 (11.2) | 1 | 79 (0.93) | 1 |
| Public (Medicare or Medicaid) | 1221 (17.7) | 1.24 (1.12 to 1.37) | 87 (1.67) | 1.16 (0.73 to 1.85) |
| Self-pay | 261 (14.6) | 1.51 (1.29 to 1.76) | 6 (1.39) | 1.26 (0.53 to 2.96) |
| Charlson comorbidity score | ||||
| Mean±SD | 0.56 (0.81) versus 0.45 (0.71)† | 1.10 (1.03 to 1.18) | 0.47 (0.85) versus 0.37 (0.65)† | 1.23 (0.95 to 1.59) |
| Admission source | ||||
| Emergency room | 1485 (15.4) | 1.29 (1.12 to 1.50) | 27 (2.65) | 2.90 (1.78 to 5.03) |
| Hospital/facility transfer | 750 (12.5) | 0.98 (0.83 to 1.15) | 20 (2.87) | 2.79 (1.42 to 5.52) |
| Elective | 456 (12.1) | 1 | 120 (0.95) | 1 |
| Treatment selection | ||||
| Clipping | 1902 (13.2) | 1 | 117 (1.54) | 1 |
| Coiling | 864 (15.4) | 1.31 (1.16-1.47) | 60 (0.84) | 0.52 (0.37-0.73) |
| Hospital location | ||||
| Northeast | 480 (14.4) | 1 | 26 (1.00) | 1 |
| Midwest | 565 (13.1) | 1.05 (0.88 to 1.25) | 35 (0.99) | 0.93 (0.52 to 1.65) |
| South | 1069 (13.5) | 0.83 (0.72 to 0.96) | 93 (1.64) | 1.21 (1.09 to 1.34) |
| West | 652 (14.4) | 0.95 (0.81 to 1.12) | 23 (0.78) | 0.65 (0.35 to 1.12) |
| Hospital size | ||||
| Small | 95 (9.80) | 0.73 (0.58 to 0.93) | 16 (1.82) | 1.69 (0.97 to 2.95) |
| Medium | 450 (15.0) | 1.14 (1.01 to 1.28) | 24 (1.21) | 2.03 (1.75 to 2.34) |
| Large | 2219 (13.8) | 1 | 136 (1.15) | 1 |
| Hospital type | ||||
| Non-teaching | 595 (15.8) | 1 | 25 (1.33) | 1 |
| Teaching | 2169 (13.3) | 0.86 (0.77 to 0.96) | 151 (1.17) | 1.09 (0.63 to 1.91) |