. 2020 Oct 16;66(1):43–55. doi: 10.1177/0706743720963905

Table 3.

Predictors of 30-day Hospital Readmission for Patients with Mental Disorders Hospitalized for Any Medical Reason (Index Hospitalization in 2014 to 2015).

	Model 1^a				Model 2^a				Model 3^a
Variables	β	P Value	OR	95% CI	β	P Value	OR	95% CI	β	P Value	OR	95% CI
Clinical variables (2012 to 2014)
Mental disorders (MD)
Adjustment disorders	0.559	0.000	1.74	1.304 to 2.344	0.532	0.000	1.703	1.268 to 2.287	0.417	0.010	1.517	1.105 to 2.084
Serious MD	0.658	0.000	1.93	1.441 to 2.589	0.637	0.000	1.891	1.404 to 2.548	0.496	0.003	1.642	1.184 to 2.276
Elixhauser comorbidity index^b
1	0.257	0.221	1.293	0.857 to 1.953	0.268	0.206	1.307	0.863 to 1.978	0.221	0.307	1.247	0.817 to 1.904
2	0.151	0.520	1.163	0.735 to 1.840	0.178	0.449	1.195	0.753 to 1.897	0.136	0.578	1.146	0.709 to 1.850
3+	−0.091	0.634	0.913	0.623 to 1.327	−0.051	0.788	0.950	0.652 to 1.383	−0.178	0.378	0.837	0.563 to 1.244
Co-occurring substance-related disorders (SRD)/chronic physical illnesses	1.345	0.000	3.838	2.889 to 5.09	1.345	0.000	3.838	2.878 to 5.118	1.368	0.000	3.923	2.912 to 5.299
Sociodemographic variables (2014 to 2015)
Material deprivation index
2					−0.135	0.625	0.874	0.509 to 1.500	−0.119	0.670	0.887	0.512 to 1.537
3					0.314	0.138	1.368	0.904 to 2.071	0.234	0.278	1.264	0.828 to 1.929
4					0.274	0.239	1.316	0.833 to 2.078	0.232	0.329	1.262	0.792 to 2.011
5					0.317	0.160	1.373	0.882 to 2.137	0.225	0.330	1.253	0.796 to 1.970
Quebec health regions (measured at the index hospitalization) (ref.: university region)
Periphery					−0.058	0.765	0.943	0.644 to 1.382	−0.076	0.702	0.927	0.628 to 1.367
Other (intermediary and remote health regions)					0.702	0.012	2.017	1.163 to 3.499	0.557	0.057	1.745	0.984 to 3.094
Service use variables
Health service use (measured 12 months before index hospitalization)
Number of outpatient consultations with the patient psychiatrist (ref.: 0)
1 to 3 consultations						.			0.340	0.120	1.405	0.915 to 2.157
4+ consultations									0.613	0.007	1.847	1.181 to 2.886
Prior emergency department (ED) visits for any medical reason (ref.: 0)
1 to 3 visits									–0.414	0.046	0.661	0.440 to 0.992
4+ visits									−0.389	0.076	0.678	0.441 to 1.041
Prior hospitalizations for any medical reason									0.603	0.001	1.827	1.283 to 2.602
Number of inpatient days for index hospitalization for any medical reason (ref.:1 to 3 days)
4 to 7 days									−0.289	0.143	0.749	0.509 to 1.103
8 to 15 days									−0.050	0.805	0.951	0.640 to 1.414
16 to 29 days									−1.867	0.000	0.155	0.081 to 0.295
30+ days									−0.289	0.143	0.749	0.509 to 1.103
Physician consultations for any medical reason after hospital discharge (measured within 30 days after discharge at index hospitalization or before readmission date)									−1.100	0.000	0.333	0.206 to 0.538
Hosmer and Lemeshow test
χ²	6.902					5.953			9.828
df	6					8			8
P	0.330					0.653			0.277

^a Adjusted logistic regression models.

^b Chronic physical illnesses included chronic pulmonary disease, cardiac arrhythmias, tumor without metastasis, renal disease, fluid electrolyte disorders, myocardial infarction, congestive heart failure, metastatic cancer, dementia, stroke, neurological disorders, liver disease, pulmonary circulation disorders, coagulopathy, weight loss, paralysis, AIDS/HIV.