Factors associated with coiling use in ruptured and unruptured aneurysms, NIS 1998–2007
| Factors | Ruptured aneurysms | Unruptured aneurysms | ||||
| Clipping (n=14 514) | Coiling (n=5620) | OR* (95% CI) | Clipping (n=7597) | Coiling (n=7168) | OR* (95% CI) | |
| Age (years) | ||||||
| Mean±SD | 52.88±13.4 | 54.55±15.2 | 1.01 (1.005 to 1.01)† | 53.3±11.8 | 52.7±16.1 | 0.99 (0.99 to 1.00)† |
| Sex | ||||||
| Female | 10 065 (69.4) | 3774 (67.4) | 1 | 5665 (74.8) | 5000 (70.4) | 1 |
| Male | 4437 (30.6) | 1822 (32.6) | 1.09 (0.99 to 1.21) | 1906 (25.2) | 2099 (29.6) | 1.26 (1.13 to 1.40) |
| Race | ||||||
| Black | 1812 (12.5) | 485 (8.6) | 1 | 548 (7.2) | 463 (6.5) | 1 |
| White | 6641 (45.8) | 2432 (43.3) | 1.30 (1.13 to 1.48) | 4050 (53.3) | 3608 (50.3) | 1.10 (0.94 to 1.29) |
| Other (Hispanic, Asian, or Native American) | 1642 (11.3) | 601 (10.7) | 1.01 (0.85 to 1.19) | 511 (6.7) | 618 (8.6) | 1.22 (0.99 to 1.51) |
| Income quartile (%) | ||||||
| <25 000 | 2372 (16.9) | 1254 (23.0) | 0.79 (0.69 to 0.91) | 1029 (13.9) | 1482 (21.1) | 0.95 (0.82 to 1.10) |
| 25 000–34 999 | 3626 (25.8) | 1376 (25.3) | 0.93 (0.81 to 1.06) | 1967 (26.5) | 1720 (24.6) | 0.87 (0.76 to 0.99) |
| 35 000–44 999 | 3764 (26.8) | 1346 (24.8) | 0.88 (0.78 to 1.00) | 2155 (29.1) | 1824 (26.1) | 0.86 (0.75 to 0.97) |
| ≥45 000 | 4272 (30.4) | 1460 (26.9) | 1 | 2261 (30.5) | 1973 (28.2) | 1 |
| Healthcare coverage | ||||||
| Private insurance | 7697 (53.2) | 2715 (48.5) | 1 | 4572 (62.7) | 3932 (57.3) | 1 |
| Public (Medicare or Medicaid) | 4794 (33.1) | 2129 (37.9) | 1.14 (1.03 to 1.27) | 2468 (33.9) | 2757 (40.1) | 1.44 (1.30 to 1.60) |
| Self-pay | 1315 (9.1) | 482 (8.5) | 0.86 (0.72 to 1.02) | 250 (3.4) | 181 (2.6) | 0.88 (0.66 to 1.18) |
| Charlson comorbidity score | ||||||
| Mean±SD | 0.44±0.70 | 0.54±0.79 | 1.18 (1.11 to 1.25) | 0.38±0.65 | 0.39±0.66 | 0.86 (0.80 to 0.92) |
| Admission source | ||||||
| Emergency room | 7556 (53.7) | 2139 (39.2) | 1 | 626 (8.5) | 394 (5.6) | 1 |
| Hospital/facility transfer | 3920 (27.9) | 2128 (39.0) | 1.64 (1.48 to 1.83) | 336 (4.6) | 363 (5.2) | 1.52 (1.15 to 2.01) |
| Elective | 2591 (18.4) | 1195 (21.8) | 1.37 (1.21 to 1.55) | 6401 (86.9) | 6221 (89.2) | 1.36 (1.13 to 1.63) |
| Hospital location | ||||||
| Northeast | 2434 (16.8) | 892 (15.9) | 1 | 1364 (17.9) | 1231 (17.2) | 1 |
| Midwest | 3109 (21.4) | 1194 (21.3) | 1.20 (1.03 to 1.40) | 1683 (22.2) | 1840 (25.7) | 1.70 (1.45 to 1.99) |
| South | 5794 (39.9) | 2182 (38.8) | 1.12 (0.98 to 1.27) | 3090 (40.7) | 2596 (36.2) | 1.13 (1.00 to 1.28) |
| West | 3177 (21.9) | 1352 (24.0) | 1.15 (0.99 to 1.33) | 1460 (19.2) | 1501 (20.9) | 1.28 (1.11 to 1.49) |
| Hospital size | ||||||
| Small | 746 (5.1) | 224 (4.0) | 1 | 583 (7.7) | 296 (4.1) | 1 |
| Medium | 2346 (16.2) | 673 (12.0) | 0.71 (0.56 to 0.90) | 1147 (15.1) | 841 (11.7) | 1.03 (0.82 to 1.31) |
| Large | 11 408 (78.7) | 4723 (84.0) | 1.11 (0.90 to 1.37) | 5863 (77.2) | 6031 (84.2) | 2.28 (1.88 to 2.76) |
| Hospital type | ||||||
| Non-teaching | 3125 (21.5) | 685 (12.2) | 1 | 1175 (15.5) | 727 (10.1) | 1 |
| Teaching | 11 375 (78.5) | 4935 (87.8) | 1.34 (1.18 to 1.52) | 6418 (84.5) | 6441 (89.9) | 1.69 (1.46 to 1.97) |
| Year | ||||||
| 1998 | 1656 | 100 | 1 | 668 | 92 | 1 |
| 1999 | 1793 | 168 | 1.62 (1.14 to 2.29) | 788 | 151 | 1.39 (0.95 to 2.04) |
| 2000 | 1830 | 153 | 1.27 (0.89 to 1.82) | 870 | 153 | 1.09 (0.73 to 1.63) |
| 2001 | 1417 | 115 | 1.29 (0.89 to 1.89) | 722 | 162 | 2.00 (1.38 to 2.90) |
| 2002 | 1446 | 303 | 3.20 (2.28 to 4.47) | 706 | 418 | 4.80 (3.37 to 6.84) |
| 2003 | 1637 | 740 | 7.92 (5.84 to 10.75) | 995 | 1146 | 8.71 (6.26 to 12.7) |
| 2004 | 1461 | 897 | 11.58 (8.53 to 15.7) | 754 | 1054 | 10.76 (7.71 to 15.0) |
| 2005 | 1131 | 956 | 15.00 (11.1 to 20.3) | 604 | 1229 | 15.37 (11.0 to 21.5) |
| 2006 | 1116 | 1218 | 20.62 (15.2 to 28.0) | 740 | 1530 | 18.72 (13.3 to 26.3) |
| 2007 | 1027 | 970 | 16.64 (12.2 to 22.7) | 750 | 1233 | 12.77 (9.10 to 17) |