Table 4

In-hospital mortality according to patient and hospital factors, NIS 1998–2007

FactorsRuptured aneurysms (20 134)Unruptured aneurysms (n=14 765)
No. of events (%)OR* (95% CI)No. of events(%)OR* (95% CI)
Age
 Mean±SD59.0 (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
 Female1976 (14.3)1125 (1.17)1
 Male789 (12.7)0.88 (0.79 to 0.99)52 (1.30)1.24 (0.87 to 1.77)
Race
 White1315 (14.5)180 (1.05)1
 Black261 (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 000504 (14.0)1.14 (0.97 to 1.34)36 (1.44)1.25 (0.68 to 2.31)
 25 000–34 999698 (14.0)1.10 (0.95 to 1.27)42 (1.14)1.11 (0.63 to 1.97)
 35 000–44 999704 (13.8)1.08 (0.94 to 1.25)53 (1.33)1.18 (0.68 to 2.04)
 ≥45 000761 (13.3)142 (0.99)1
Healthcare coverage
 Private insurance1163 (11.2)179 (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-pay261 (14.6)1.51 (1.29 to 1.76)6 (1.39)1.26 (0.53 to 2.96)
Charlson comorbidity score
 Mean±SD0.56 (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 room1485 (15.4)1.29 (1.12 to 1.50)27 (2.65)2.90 (1.78 to 5.03)
 Hospital/facility transfer750 (12.5)0.98 (0.83 to 1.15)20 (2.87)2.79 (1.42 to 5.52)
 Elective456 (12.1)1120 (0.95)1
Treatment selection
 Clipping1902 (13.2)1117 (1.54)1
 Coiling864 (15.4)1.31 (1.16-1.47)60 (0.84)0.52 (0.37-0.73)
Hospital location
 Northeast480 (14.4)126 (1.00)1
 Midwest565 (13.1)1.05 (0.88 to 1.25)35 (0.99)0.93 (0.52 to 1.65)
 South1069 (13.5)0.83 (0.72 to 0.96)93 (1.64)1.21 (1.09 to 1.34)
 West652 (14.4)0.95 (0.81 to 1.12)23 (0.78)0.65 (0.35 to 1.12)
Hospital size
 Small95 (9.80)0.73 (0.58 to 0.93)16 (1.82)1.69 (0.97 to 2.95)
 Medium450 (15.0)1.14 (1.01 to 1.28)24 (1.21)2.03 (1.75 to 2.34)
 Large2219 (13.8)1136 (1.15)1
Hospital type
 Non-teaching595 (15.8)125 (1.33)1
 Teaching2169 (13.3)0.86 (0.77 to 0.96)151 (1.17)1.09 (0.63 to 1.91)
  • * ORs were adjusted for age, sex, race, income quartile, primary payer, admission source, treatment selection, Charlson comorbidity score and hospital characteristics (location, size and teaching status).

  • Mean±SD for those who died in hospital versus did not die in-hospital.