Table 7. Comparison of demographics and clinical characteristics using the SF-12 MCS and its associated univariate analysis.
| Demographic and clinical characteristics | MCS < 50 (n = 193) | MCS ≥ 50 (n = 286) | Odds ratio; 95% CI | p value |
|---|---|---|---|---|
| Age | ||||
| Mean (± SD) | 46.4 (± 17.5) | 48.2 (± 20.2) | – | – |
| Elderly | 31 (16.1%) | 73 (25.5%) | – | – |
| Gender | ||||
| Male | 131 (67.9%) | 213 (74.5%) | – | – |
| Female | 62 (32.1%) | 73 (25.5%) | – | – |
| Ratio | 2.1 | 2.9 | – | – |
| Mechanism of injury | ||||
| Motor vehicle occupants | 109 (56.5%) | 115 (40.2%) | – | – |
| Unprotected road users | 24 (12.4%) | 35 (12.2%) | – | – |
| Low falls (<1 m) | 17 (8.8%) | 35 (12.2%) | – | – |
| High falls (>1 m) | 26 (13.5%) | 73 (25.5%) | – | – |
| Significant collision (not road related) | 15 (7.8%) | 25 (8.7%) | – | – |
| Other causes | 2 (1%) | 3 (1%) | – | – |
| Injury Severity Score | ||||
| Median | 17 | 14 | – | – |
| 25th/75th percentile | 12/25 | 9/22 | – | – |
| Severe | 106 (54.9%) | 127 (44.4%) | 1.53; 1.06–2.20 | 0.02 |
| Vital signs | ||||
| Normal | 74 (38.3%) | 134 (46.9%) | – | – |
| Hypoxia | 49 (25.4%) | 60 (21%) | 1.28; 0.83–1.97 | 0.26 |
| Hypotension | 35 (18.1%) | 34 (11.9%) | 1.64; 0.98–2.74 | 0.06 |
| Hypertension | 31 (16.1%) | 48 (16.8%) | 0.95; 0.58–1.55 | 0.83 |
| Bradycardia | 6 (3.1%) | 8 (2.8%) | 1.12; 0.38–3.27 | 0.84 |
| Tachycardia | 66 (34.2%) | 82 (28.7%) | 1.29; 0.87–1.91 | 0.20 |
| Hypothermia | 13 (6.7%) | 16 (5.6%) | 1.22; 0.57–2.60 | 0.61 |
| Blood sugar level (mmol/L) | ||||
| < 8 | 124 (64.2%) | 211 (73.8%) | – | – |
| ≥ 8 | 69 (35.8%) | 75 (26.2%) | 1.57; 1.05–2.32 | 0.03 |
| Coagulation profile | ||||
| Normal | 149 (77.2%) | 213 (74.5%) | 1.16; 0.76–1.78 | 0.50 |
| Deranged | 44 (22.8%) | 73 (25.5%) | – | – |
| Traumatic brain injury | ||||
| None | 154 (79.8%) | 245 (85.7%) | – | – |
| Mild | 30 (15.5%) | 29 (10.2%) | 1.63; 0.94–2.81 | 0.08 |
| Moderate/severe | 9 (4.7%) | 12 (4.1%) | 1.12; 0.46–2.70 | 0.81 |
| Chronic comorbidities | ||||
| None | 79 (40.9%) | 138 (48.3%) | – | – |
| 1 | 43 (22.3%) | 57 (19.9%) | 1.15; 0.73–1.80 | 0.54 |
| 2 or more | 71 (36.8%) | 91 (31.8%) | 1.25; 0.85–1.83 | 0.26 |
Abbreviations: CI, confidence interval; MCS, Mental Composite Score; SD, standard deviation; SF-12, Short Form 12-Questionnaire Health Survey.
Note: Variables in bold demonstrate trend toward suboptimal SF-12 MCS scores.