Table 1.
Comparison of patient characteristics in the No ChIP (Review only and No ChIP) and Yes ChIP cohorts
| Characteristics | No ChIP (n = 134, 31.6%) | Yes ChIP (n = 290) | p value | ||
|---|---|---|---|---|---|
| Median | IQR | Median | IQR | ||
| Age (years) | 81.0 | 66–88 | 79.50 | 69–87 | <.001 |
| ISS | 4.0 | 2–9 | 5.00 | 2–9 | .466 |
| nISS | 4.0 | 2–9 | 5.00 | 2–10 | .281 |
| AIS score chest | 2.0 | 1–3 | 1.00 | 1–3 | .308 |
| Number of radiological rib fractures | 1.0 | 0–3 | 0.00 | 0–2 | .476 |
| Time from injury to arrival (hr) | 8.8 | 1.3–51.4 | 8.38 | 1.4–46.7 | .422 |
| Charlson Comorbidity Scoreǂ | 1.0 | 0–2 | 1.00 | 0–1 | .009 |
| n (%) | 95% CI | n (%) | 95% CI | p value | |
| Male | 56 (41.8) | 33.4–50.1 | 134 (46.2) | 40.5–51.9 | .395 |
| Mechanism of injurya | |||||
| Motor vehicle collision | 11 (8.2) | 3.6–12.9 | 8 (2.8) | 0.9–4.6 | .012 |
| Vulnerable road userb | 3 (2.2) | −0.3 to 4.7 | 6 (2.1) | 0.4–3.7 | .581 |
| Fall <1 m | 98 (73.1) | 65.6–80.6 | 247 (85.2) | 81.1–89.3 | .003 |
| Fall >1 m | 13 (9.7) | 4.7–14.7 | 17 (5.9) | 3.2–8.6 | .152 |
| Other | 9 (6.7) | 2.5–11 | 12 (4.1) | 1.8–6.4 | .255 |
| Time/day of arrivalb | |||||
| In Hour (0730 –2159 hours) | 111 (83.5) | 77.2–89.7 | 229 (79) | 74.3–83.7 | .280 |
| Out Hour (2200–0729 hours) | 22 (16.5) | 10.3–22.8 | 61 (21) | 16.3–25.7 | |
| Weekday (Mon–Fri) | 93 (69.4) | 61.6–77.2 | 192 (66.2) | 60.8–71.7 | .515 |
| Weekend (Sat–Sun) | 41 (30.6) | 22.8–38.4 | 98 (33.8) | 28.3–39.2 | |
a
Vulnerable road user: collision involving cyclist, motorbike or pedestrian. ChIP, chest injury protocol; IQR, interquartile range; ISS, injury severity score; nISS, new injury severity score; AIS, Abbreviated Injury Scale; CI, confidence interval.
b
Fisher Exact Test for Charlson Score, Vulnerable road user due to small cell size.