Table 1

Characteristics of study patients

	N	Age under 65	N	Age 65 or older
All patients	14 146		10 936
Demographics
Male	11 006	77.8% (77.1% to 78.5%)	5529	50.6% (49.6% to 51.5%)
Age		37.0 (24.9–50.3)		81.3 (74.8–87.0)
Presenting GCS		13 (8–15)		14 (11–15)
Underwent surgical procedure	1339	9.5% (9.0% to 9.9%)	451	4.1% (3.8% to 4.5%)
Injury severity
ISS		17 (14–25)		18 (16–25)
Head AIS		4 (3–5)		4 (4–5)
Highest AIS head
3	4611	32.6% (31.8% to 33.4%)	1881	17.2% (16.5% to 17.9%)
4	5365	37.9% (37.1% to 38.7%)	4640	42.4% (41.5% to 43.4%)
5	4170	29.5% (28.2% to 30.2%)	4415	40.4% (39.5% to 41.3%)
Mechanism of injury
Fall <2 m	2865	20.3% (19.6% to 20.9%)	7619	69.7% (68.8% to 70.5%)
Fall >2 m	2485	17.6% (16.9% to 18.2%)	1819	16.6% (15.9% to 17.3%)
RTC driver or passenger	1697	12.0% (11.5% to 12.5%)	222	2.0% (1.8% to 2.2%)
RTC cyclist or pedestrian	3018	21.3% (20.6% to 22.0%)	873	8.0% (7.5% to 8.4%)
Other	4806	9.2% (8.7% to 9.7%)	363	1.7% (1.4% to 1.9%)
Outcome
Mortality by AIS level
3	89	2.2% (1.7% to 2.6%)	200	11.1% (9.6% to 12.5%)
4	220	4.7% (4.1% to 5.4%)	724	16.3% (15.2% to 17.4%)
5	996	27.7% (26.2% to 29.2%)	2032	48.9% (47.4% to 50.4%)
Overall mortality	1305	10.5% (10.0% to 11.1%)	2956	28.4% (27.5% to 29.3%)