Table 2.

Results of the multivariate ordered logistic (1) and logistic (2) regression models

Variable	Coeff.	SE	z	p
Model 1. Number of Emergency Department visits in the previous year
Log likelihood = -1347.38, χ2 = 99.01 (6 df), p < 0.0001
On pharmacological treatment	0.51	0.12	4.13	< 0.001
Comorbidity index	0.17	0.07	2.48	0.013
Distance from patients' home to hospital:
> 10 Km*	-	-	-	-
< 1 Km	0.27	0.11	2.49	0.013
Educational level	-0.03	0.15	-1.82	0.069
Employment status	-0.2	0.11	-1.76	0.079
Basic Activities of Daily Living score	-0.09	0.05	-1.71	0.088
Variable	OR	SE	95% CI	p
Model 2. Index visit as a re-utilization of the Emergency Department after 72 hours from a previous Emergency Department visit
Log likelihood = -451.26, χ2 = 284.73 (15 df), p < 0.0001
Number of Emergency Department visits in the previous year	5.0	0.65	3.89–6.45	< 0.001
Referral	3.12	0.86	1.81–5.35	< 0.001
Duration of presenting problem prior to arrive at the Emergency Department:
< 1 hour*	1.0
1–24 hours	1.91	0.42	1.25–2.94	0.003
> 24 hours	2.06	0.51	1.27–3.37	0.004
On pharmacological treatment	0.56	0.13	0.36–0.86	0.009
Mode of transportation to the Emergency Department:
Ambulance*	1.0
Car driven by other person	3.22	1.61	1.21–8.58	0.019
Car driven by patient/On foot	2.54	1.36	0.89–7.24	0.08
Emergency Department discharge diagnosis	1.56	0.3	1.07–2.28	0.022
Hospital admission after Emergency Department visit	1.82	0.51	1.06–3.14	0.031
Age	0.99	0.01	0.98–0.99	0.039
Therapeutic procedure(s) received at the Emergency Department	0.69	0.14	0.47–1.01	0.057
Physician consultation(s) received at the Emergency Department	0.72	0.14	0.49–1.07	0.1
Day of the week of attending the Emergency Department	1.42	0.34	0.89–2.26	0.14
Prescription of therapy	0.8	0.15	0.55–1.16	0.24
Investigation(s) received at the Emergency Department	0.82	0.16	0.57–1.19	0.31

*Reference category