Table 1. Site ED characteristics, collection dates and CT types used.

Site	ED type	Region	ED Adult attendances during study (per. year)	CT(s) used- slice	Dates data collected
A	Mixed- outer metro	WA	67600 (44700)	64*/128	1/13-6/14
B	Major tertiary–metro mixed	Victoria	50100 (42100)	128/320*	4/13-6/14
C	Major tertiary -regional	Qld	110000 (57900)	256/320*x2	8/12-6/14
D	Outer metro mixed	Qld	84800 (42400)	128x2	7/12-6/14
E	Tertiary/outer metro mixed	Victoria	83300 (100000)	64*/256*/ 320	2/14-11/14
F	Regional- mixed secondarysecondary	NZ	231900 (14500–20500)	16	10/01-6/14
G	Major tertiary adult	Qld	44800 (59700)	64/128x2 /256*x2	10/13-6/14
H	Major tertiary adult	Qld	70200(70200)	64/128*/256	7/13-6/14
I	Mixed major—tertiary	NSW	37600 (56400)	64/256x2*	7/14-2/15
J	Major tertiary—adult	WA	80300 (80300)	64*/128x2	7/13-6/14
K	Major tertiary adult	WA	128000 (64000)	64/320*	2/12-1/14
L	Major tertiary mixed	Qld	33900 (50800)	64/256*x2 /320	11/13-6/14
M	Outer metro- mixed	NSW	38700 (38700)	80	7/13-6/14
N	Major referral -regional mixed	Qld	60800 (60800)	64/256*	1/14-12/14

*Main scanner used for CTPA. WA = Western Australia, Qld- = Queensland, NZ- New Zealand, NSW–New South Wales