Table 1.
Comparison of pre-operative patient characteristics (before and after propensity matching)
| Categorical variable | Unmatched | Matched 1:1 | ||||||
| Sequential firing (n = 3829) | Titan (n = 807) | p-value | 95% CI for difference | Sequential firing (n = 783) | Titan (n = 783) | p-value | 95% CI for difference | |
| Female | 2944 (76.8%) | 629 (77.9%) | 0.55 | (− 0.04, 0.02) | 610 (77.9%) | 610 (77.9%) | Exact match forced | |
| Race | < 0.01 | N/A | Exact match forced | |||||
| Black | 358 (9.4%) | 61 (7.65%) | 61 (7.8%) | 61 (7.8%) | ||||
| Other | 97 (2.5%) | 93 (11.5%) | 72 (9.2%) | 72 (9.2%) | ||||
| White | 3374 (88.1%) | 653 (80.9%) | 650 (83.0%) | 650 (83.0%) | ||||
| ASA class | < 0.01 | N/A | Exact match forced | |||||
| 1–2 | 316 (8.3%) | 37 (4.6%) | 37 (4.7%) | 37 (4.7%) | ||||
| 3 | 3372 (88.1%) | 736 (91.2%) | 718 (91.7%) | 718 (91.7%) | ||||
| 4 | 141 (3.7%) | 34 (4.2%) | 28 (3.6%) | 28 (3.6%) | ||||
| Smoker | 414 (10.8%) | 54 (6.7%) | < 0.01 | (0.02, 0.06) | 62 (7.9%) | 54 (6.9%) | 0.32 | (− 0.02, 0.04) |
| Diabetes at baseline | 1084 (28.3%) | 175 (21.7%) | < 0.01 | (0.03, 0.10) | 180 (23.0%) | 168 (21.5%) | 0.39 | (− 0.03, 0.06) |
| GERD at baseline | 1651 (43.1%) | 293 (36.3%) | < 0.01 | (0.03, 0.10) | 302 (38.6%) | 286 (36.5%) | 0.35 | (− 0.03, 0.07) |
| Hyperlipidemia at baseline | 1120 (29.3%) | 182 (22.6%) | < 0.01 | (0.03, 0.10) | 183 (23.4%) | 178 (22.7%) | 0.73 | (− 0.04, 0.05) |
| Hypertension at baseline | 1943 (50.7%) | 340 (42.1%) | < 0.01 | (0.05, 0.12) | 325 (41.5%) | 335 (42.8%) | 0.37 | (− 0.06, 0.04) |
| Sleep apnea at baseline | 1500 (39.2%) | 309 (38.3%) | 0.66 | (− 0.03, 0.05) | 311 (39.7%) | 299 (38.2%) | 0.52 | (− 0.03, 0.06) |
| History of DVT | 195 (5.1%) | 36 (4.5%) | 0.53 | (− 0.01, 0.02) | 37 (4.7%) | 35 (4.5%) | 0.80 | (− 0.02, 0.02) |
| History of PE | 94 (2.5%) | 23 (2.9%) | 0.54 | (− 0.02, 0.01) | 25 (3.2%) | 22 (2.8%) | 0.87 | (− 0.01, 0.02) |
| Therapeutic anticoagulation | 162 (4.2%) | 38 (4.7%) | 0.57 | (− 0.02, 0.01) | 37 (4.7%) | 38 (4.9%) | 0.90 | (− 0.02, 0.02) |
| Continuous variable | Unmatched | Matched | ||||||
| Sequential firing (n = 3829) | Titan (n = 806) | p-value | 95% CI for shift | Sequential firing (n = 783) | Titan (n = 783) | p-value | 95% CI for shift | |
| Median (IQR) | Median (IQR) | |||||||
| Age at baseline | 44 (35–54) | 42 (33–52) | < 0.01 | (− 3, − 1) | 42 (33–52) | 43 (33–52) | 0.57 | (− 2, 1) |
| BMI at baseline | 47.6 (43.1–53.3%) | 47.1 (43.5–52.1) | 0.44 | (− 0.7, 0.3) | 47.1 (43.0–52.8) | 47.1 (43.4–52.1) | 0.70 | (− 0.5, 0.8) |