Adjusted* risk ratios for the association between determinants of red blood cell transfusion
| Effect | Risk ratio (95% CI) |
|---|---|
| Sex | 1.16 (1.10 to 1.23) |
| Age | |
| 18–55 | 1.00 |
| 56–65 | 1.14 (1.04 to 1.24) |
| 66–75 | 0.96 (0.84 to 1.09) |
| ≥75 | 0.81 (0.72 to 0.90) |
| Comorbidities | |
| 0 | 1.00 |
| 1 | 1.11 (1.02 to 1.21) |
| ≥2 | 1.66 (1.40 to 1.97) |
| Other specific comorbidities considered | |
| Ischaemic heart disease | 1.19 (0.93 to 1.53) |
| Cerebrovascular disease | 1.17 (0.95 to 1.43) |
| Anaemia | 2.10 (1.81 to 2.43) |
| Coagulopathy | 1.37 (1.08 to 1.74) |
| Sepsis | 1.57 (1.23 to 2.01) |
| Hypovolemic shock | 1.33 (1.19 to 1.47) |
| Bleeding/haemorrhage | 1.12 (1.03 to 1.22) |
| Brain trauma severity | |
| Moderate TBI (GCS 9–12) | 0.78 (0.70 to 0.87) |
| Serious head injury (AIS≥3) | 0.93 (0.81 to 1.07) |
| Serious extracerebral injury by anatomic region | |
| Face | 1.36 (1.22 to 1.51) |
| Thorax and abdomen | 1.76 (1.55 to 2.00) |
| Spine | 1.24 (1.08 to 1.43) |
| Upper extremities | 1.25 (1.12 to 1.40) |
| Lower extremities | 1.88 (1.75 to 2.02) |
| Others | 1.48 (0.96 to 2.29) |
*Adjusted for all covariates in the table.
AIS, Abbreviated Injury Severity Score; GCS, Glasgow Coma Scale; TBI, traumatic brain injury.