Table 1

Mean monthly attendances per HIU enrolled in SHarED across the six participating EDs

Months of follow-up	HIUs (n)	Mean monthly number of ED visits pre-enrolment and post-enrolment in SHarED						Difference in the monthly number of ED visits
		Baseline 12 months		Baseline equal to follow-up period		Follow-up		12 months baseline				Baseline equal to follow-up period
		Mean	SD	Mean	SD	Mean	SD	Value	95% CI	P value	Change (%)	Value	95% CI	P value	Change (%)
3	148	1.6	1.0	2.4	2.1	1.6	1.9	0.0	−0.29 to 0.30	0.991	0	−0.8	−1.12 to −0.41	<0.001	−33
4	142	1.6	1.0	2.3	1.7	1.5	1.8
5	135	1.7	1.0	2.2	1.5	1.5	1.6
6	127	1.6	1.0	2.1	1.3	1.4	1.5	−0.3	−0.55 to −0.03	0.030	−13	−0.7	−0.98 to −0.43	<0.001	−33
7	116	1.7	1.0	2.0	1.2	1.3	1.4
8	110	1.7	1.0	1.9	1.1	1.3	1.4
9	96	1.8	1.0	1.9	1.0	1.3	1.4	−0.5	−0.72 to −0.17	0.002	−28	−0.6	−0.88 to −0.34	<0.001	−32
10	81	1.8	1.0	1.9	1.1	1.3	1.4
11	45	1.5	0.9	1.5	0.9	1.1	1.2
12	33	1.6	1.0	1.6	1.0	1.0	1.3	−0.5	−0.93 to −0.13	0.011	−38	−0.5	−0.93 to −0.13	0.011	−38

ED, emergency department; HIU, high-impact user; SHarED, Supporting High impAct useRs in Emergency Departments.