Table 1.
Descriptive Statistics of Variables by Fusion Type
| Overall | Posterior (n=5450) | Anterior (n=791) | 360 Fusion (n=1230) | OPMI Fusion (n=906) | p | |
|---|---|---|---|---|---|---|
| Demographic Characteristics | N (%) | N (%) | N (%) | N (%) | N (%) | |
| 20–29 | 227 (2.71) | 141 (2.59%) | 25 (3.16%) | 35 (2.85%) | 26 (2.87%) | |
| 30–39 | 910 (10.86) | 500 (9.17%) | 155 (19.6%) | 158 (12.85%) | 97 (10.71%) | |
| 40–49 | 2173 (25.94) | 1284 (23.56%) | 303 (38.31%) | 347 (28.21%) | 239 (26.38%) | |
| 50–63 | 5067 (60.49) | 3525 (64.68%) | 308 (38.94%) | 690 (56.1%) | 544 (60.04%) | |
| Gender | 0.47 | |||||
| Male | 3675(43.87) | 2410 (44.22%) | 343 (43.36%) | 516 (41.95%) | 406 (44.81%) | |
| Female | 4702 (56.13) | 3040 (55.78%) | 448 (56.64%) | 714 (58.05%) | 500 (55.19%) | |
| Region | 0.003 | |||||
| Midwest | 2306 (27.54) | 1530 (28.08) | 245 (30.97) | 332 (27.06) | 199 (21.96) | |
| Northeast | 484 (5.78) | 299 (5.49) | 41 (5.18) | 84 (6.85) | 60 (6.62) | |
| South | 4410 (52.68) | 2870 (52.68) | 389 (49.18) | 633 (51.59) | 518 (57.17) | |
| West | 1172 (14.00) | 749 (13.75) | 116 (14.66) | 178 (14.51) | 129 (14.24) | |
| Indication | .0001 | |||||
| Degenerative | 7141 (85.25) | 4722 (86.64%) | 629 (79.52%) | 1054 (85.69%) | 736 (81.24%) | |
| Post-Laminectomy | 391 (4.67) | 239 (4.39%) | 41 (5.18%) | 79 (6.42%) | 32 (3.53%) | |
| Re-Fusion | 489 (5.84) | 326 (5.98%) | 32 (4.05%) | 74 (6.02%) | 57 (6.29%) | |
| Other | 356 (4.25) | 163 (2.99%) | 89 (11.25%) | 23 (1.87%) | 81 (8.94%) | |
| Comorbidity | ||||||
| Elixhauser Score | .0001 | |||||
| 0 | 4229 (50.48) | 2655 (48.72) | 467 (59.04) | 625 (50.81) | 482 (53.20) | |
| 1 | 2328 (27.79) | 1549 (28.42) | 199 (25.16) | 347 (28.21) | 233 (25.72) | |
| 2+ | 1820 (21.73) | 1246 (22.86) | 125 (15.80) | 258 (20.98 | 191 (21.08) | |
| Depression | 925 (11.04) | 575 (10.55%) | 109 (13.78%) | 151 (12.28%) | 90 (9.93%) | 0.02 |
| Obesity | 341 (4.07) | 222 (4.07%) | 24 (3.03%) | 50 (4.07%) | 45 (4.97%) | 0.26 |
| Smoking | 390 (4.66) | 251 (4.61%) | 39 (4.93%) | 56 (4.55%) | 44 (4.86%) | 0.96 |
| OPR Pre-Fusion | 0.15 | |||||
| Q1: 0 | 1332 (15.90) | 896 (16.44%) | 112 (14.16) | 189 (15.37) | 135 (14.90) | |
| Q2: 1–22 days | 1765 (21.07) | 1172 (21.50) | 146 (18.46) | 248 (20.16) | 199 (21.96) | |
| Q3: 23–72 days | 1771 (21.14) | 1152 (21.14) | 174 (22.00) | 267 (21.71) | 178 (19.65) | |
| Q4: 73–250 days | 1749 (20.88) | 1136 (20.84) | 178 (22.50) | 243 (19.76) | 192 (21.19) | |
| Q5: 250+ | 1760 (21.01 | 1094 (20.07) | 181 (22.88) | 283 (23.01) | 202 (22.30) | |
| OPR Post-Fusion | ||||||
| Dispensed >=365 days | 2458 (29.34) | 1557 (28.57%) | 235 (29.71%) | 403 (32.76%) | 263 (29.03%) | 0.035 |