Table 1. Demographic and Summary Data for All Patients and by Study Group.
| Variable | No. (%) | P Value | |||||
|---|---|---|---|---|---|---|---|
| Overall | Nonoverlapping Surgery | Overlapping Surgery | |||||
| Unweighted (n = 2275) | Weighted (n = 2607) | Unweighted (n = 972) | Weighted (n = 1306) | Unweighted (n = 1303) | Unweighted | Weighted | |
| Type of overlap | |||||||
| No overlap | 972 (42.7) | 1307 (50.1) | 972 (100) | 1306 (100) | 0 | NA | NA |
| In-room overlap | 231 (10.2) | 231 (8.9) | 0 | 0 | 231 (17.7) | NA | NA |
| Skin-to-skin overlap | 1072 (47.1) | 1072 (41.1) | 0 | 0 | 1072 (82.3) | NA | NA |
| Patient characteristics | |||||||
| Sex | .005 | .76 | |||||
| Female | 1259 (55.3) | 1518 (57.9) | 505 (52.0) | 764 (58.5) | 754 (57.9) | ||
| Male | 1016 (4.7) | 1092 (41.9) | 467 (48.0) | 543 (41.6) | 549 (42.1) | ||
| Age, mean (SD), y | 52.1 (16.4) | 52 (17.5) | 51.9 (16.6) | 51.9 (19.0) | 52.2 (52.2) | .69 | .66 |
| ASA score | .07 | .51 | |||||
| 1-2 | 685 (30.1) | 841 (32.3) | 273 (28.1) | 429 (32.9) | 412 (31.6) | ||
| ≥3 | 1590 (70.0) | 1769 (67.9) | 699 (71.9) | 878 (67.2) | 891 (68.4) | ||
| mRS score at baseline | <.001 | .95 | |||||
| 0-2 | 1768 (77.7) | 2115 (81.1) | 713 (73.4) | 1060 (81.2) | 1055 (81.0) | ||
| 3-5 | 506 (22.2) | 496 (19.0) | 258 (26.5) | 248 (19.0) | 248 (19.0) | ||
| Surgery characteristics | |||||||
| Surgical staff | |||||||
| Cosurgeon present | 451 (19.8) | 627 (24.1) | 148 (15.2) | 324 (24.8) | 303 (23.3) | <.001 | .38 |
| Fellow present | 439 (19.3) | 473 (18.1) | 225 (23.1) | 258 (19.8) | 214 (16.4) | <.001 | .03 |
| Resident present | 2080 (91.4) | 2372 (91.0) | 896 (92.2) | 1188 (91.0) | 1184 (91.0) | .27 | .96 |
| Urgency | <.001 | .97 | |||||
| Elective | 2054 (90.3) | 2427 (93.1) | 842 (86.6) | 1215 (93.0) | 1212 (93.0) | ||
| Emergent/urgent | 221 (9.7) | 182 (7.0) | 130 (13.4) | 91 (7.0) | 91 (7.0) | ||
| Admission status | .07 | .91 | |||||
| Day surgery | 350 (15.4) | 435 (16.7) | 134 (13.8) | 219 (16.8) | 216 (16.6) | ||
| Admitted | 1925 (84.6) | 2175 (83.4) | 838 (86.2) | 1088 (83.3) | 1087 (83.4) | ||
| Surgery category | <.001 | .98 | |||||
| CSF diversion | 188 (8.3) | 156 (6.0) | 109 (11.2) | 77 (6.0) | 79 (6.1) | ||
| Functional | 527 (23.2) | 601 (22.9) | 222 (22.8) | 296 (22.7) | 305 (23.4) | ||
| Other | 151 (6.6) | 144 (5.6) | 81 (8.3) | 73 (5.7) | 70 (5.4) | ||
| Peripheral nerve | 233 (10.2) | 293 (11.2) | 87 (9.0) | 147 (11.1) | 146 (11.2) | ||
| Spine | 71 (3.1) | 87 (3.3) | 27 (2.8) | 43 (3.3) | 44 (3.4) | ||
| Tumor | 813 (35.7) | 977 (37.6) | 334 (34.4) | 498 (38.4) | 479 (36.8) | ||
| Vascular | 292 (12.8) | 354 (13.5) | 112 (11.5) | 174 (13.2) | 180 (13.8) | ||
Abbreviations: ASA, American Society of Anesthesiologists; CSF, cerebrospinal fluid; mRS, modified Rankin Scale; NA, not applicable.