Multivariable linear regression for length of stay (days) fitted with a generalised estimating equation
| Coefficient | 95% CI | P value | |
| Initial FAST or Initial CT | |||
| Initial FAST | 3.5 | 1.0 to 5.9 | 0.006 |
| Initial CT | Reference | ||
| Age, by 1 year increase | −0.1 | −0.2 to 0.07 | <0.001 |
| Sex | |||
| Male | Reference | ||
| Female | 1.9 | 0.3 to 3.5 | 0.02 |
| TRISS | |||
| Very low (0–0.92) | Reference | ||
| Low (0.93–0.97) | −13.2 | −15.5 to 10.9 | <0.001 |
| High (0.98–0.99) | −13.4 | −16.2 to 10.6 | <0.001 |
| Very high (>0.99) | −24.3 | −27.4 to 21.3 | <0.001 |
| Type of trauma | |||
| Blunt | Reference | ||
| Penetrating | −5.0 | −8.3 to 1.8 | 0.02 |
| Cause of trauma | |||
| Accident | Reference | ||
| Suicide | 9.9 | 6.3 to 13.4 | <0.001 |
| Violence | −4.6 | −7.5 to 1.7 | 0.002 |
| Others | 0.9 | −4.5 to 6.2 | 0.75 |
| Year | |||
| 2004–2006 | Reference | ||
| 2007–2009 | −1.7 | −5.3 to 2.0 | 0.37 |
| 2010–2012 | −3.3 | −6.6 to 0.05 | 0.05 |
| 2013–2015 | −4.0 | −7.1 to 1.0 | 0.01 |
| 2016 | −2.9 | −5.9 to 0.03 | 0.05 |
FAST, focused assessment with sonography in trauma; TRISS, Trauma and Injury Severity Score.