Table 1.
Patient characteristics among all cohorts and propensity-score-matched cohort
| All patients | Propensity-score-matched patients | |||||
|---|---|---|---|---|---|---|
| Pelvic angiography (+) | Pelvic angiography (−) | SMD | Pelvic angiography (+) | Pelvic angiography (−) | SMD | |
| (N = 221) | (N = 1130) | (N = 200) | (N = 200) | |||
| Age, median (IQR) | 17 (15–19) | 16 (13–18) | 0.260 | 17 (15–19) | 17 (15–18) | 0.000 |
| Male, n (%) | 124 (56.1) | 684 (60.5) | 0.090 | 112 (56.0) | 124 (62.0) | 0.120 |
| Time of the day, n (%) | ||||||
| Daytime (9:00 am—5:59 pm) | 84 (32.1) | 458 (40.5) | 0.050 | 77 (38.5) | 81 (40.5) | 0.040 |
| Nighttime (6:00 pm—8:59 am) | 127 (60.6) | 614 (54.3) | 0.060 | 114 (57.0) | 113 (56.5) | 0.010 |
| Unknown | 10 (5.0) | 58 (5.1) | 0.030 | 9 (4.5) | 6 (3.0) | 0.080 |
| Weekend, n (%) | 48 (21.7) | 334 (29.6) | 0.180 | 46 (23.0) | 45 (22.5) | 0.010 |
| Shock on hospital arrival, n (%) | 46 (18.1) | 74 (6.5) | 0.420 | 36 (18.0) | 34 (17.0) | 0.030 |
| ISS, median (IQR) | 30 (21–41) | 18 (10–29) | 0.830 | 29 (20–38) | 28 (17–42) | 0.040 |
| Number of patients with AIS ≥ 3 by body region, n (%) | ||||||
| Head | 61 (27.6) | 320 (28.3) | 0.020 | 51 (25.5) | 54 (27.0) | 0.030 |
| Face | 4 (1.8) | 12 (1.1) | 0.060 | 4 (2.0) | 5 (2.5) | 0.030 |
| Thorax | 115 (52.0) | 496 (43.9) | 0.160 | 98 (49.0) | 96 (48.0) | 0.020 |
| Abdomen | 66 (29.9) | 115 (10.2) | 0.510 | 52 (26.0) | 51 (25.5) | 0.010 |
| Spine | 19 (8.6) | 73 (6.5) | 0.080 | 16 (8.0) | 18 (9.0) | 0.040 |
| Upper extremity | 18 (8.1) | 78 (6.9) | 0.050 | 15 (7.5) | 20 (10.0) | 0.090 |
| Lower extremity including pelvis | 186 (84.2) | 500 (44.2) | 0.920 | 166 (83.0) | 164 (82.0) | 0.030 |
| Unspecified | 1 (0.1) | 1 (0.1) | 0.070 | 1 (0.5) | 1 (0.5) | 0.000 |
| Mechanism of injury, n (%) | ||||||
| Car occupants | 15 (6.8) | 131 (11.6) | 0.170 | 15 (7.5) | 15 (7.5) | 0.000 |
| Motorcycle | 61 (27.6) | 275 (24.3) | 0.070 | 55 (27.5) | 58 (29.0) | 0.030 |
| Bicycle | 26 (11.8) | 179 (15.8) | 0.120 | 26 (13.0) | 32 (16.0) | 0.090 |
| Pedestrian | 22 (10.0) | 186 (16.5) | 0.190 | 20 (10.0) | 14 (7.0) | 0.110 |
| Fall from high place | 79 (35.7) | 283 (25.0) | 0.230 | 66 (33.0) | 69 (34.5) | 0.030 |
| Other | 16 (7.2) | 62 (5.5) | 0.070 | 16 (8.0) | 12 (6.0) | 0.080 |
| Unknown | 3 (1.4) | 19 (1.7) | 0.030 | 3 (1.5) | 1 (0.5) | 0.100 |
| Calendar year, n (%) | ||||||
| 2004–2006 | 22 (10.0) | 87 (7.7) | 0.080 | 19 (9.5) | 21 (10.5) | 0.030 |
| 2007–2009 | 52 (23.5) | 241 (21.3) | 0.050 | 47 (23.5) | 48 (24.0) | 0.010 |
| 2010–2012 | 57 (25.8) | 400 (35.4) | 0.210 | 54 (27.0) | 54 (27.0) | 0.000 |
| 2013–2015 | 90 (40.7) | 402 (35.6) | 0.110 | 80 (40.0) | 77 (38.5) | 0.030 |
The area under the receiver operating characteristic curve of the logistic regression model to calculate a propensity score was 0.823
IQR interquartile range, ISS injury severity score, AIS abbreviated injury scale, SMD standard mean difference