The Association with COPD Readmission Rate and Access to Medical Institutions in Elderly Patients

Figures & data

Figure 1 Flowchart of the study population.

Table 1 Characteristics of the Patient According to Re-Admission Status at 30 Days After Discharge

Variables		Not Re-Admitted n (%) (n=4053)	Re-Admitted (≤30 Days) n (%) (n=814)	Re-Admission Rate (%)	P-value
Age, years	70–74	701 (17.3)	155 (19.0)	18.1	0.086
	75–79	1348 (33.3)	234 (28.7)	14.8
	80–84	1192 (29.4)	257 (31.6)	17.7
	≥85	812 (20.0)	168 (20.6)	17.1
Sex	Male	2745 (67.7)	618 (75.9)	18.4	<0.001
	Female	1308 (32.3)	196 (24.1)	13.0
Institution type	District hospital	2971 (73.3)	558 (68.6)	15.8	0.006
	Hospital	1082 (26.7)	256 (31.4)	19.1
Insurance type	Self-employed insured	1008 (24.9)	174 (21.4)	14.7	<0.001
	Employee insured	2404 (59.3)	447 (54.9)	15.7
	Medical aid	641 (15.8)	193 (23.7)	23.1
Insurance quintile	0	641 (15.8)	193 (23.7)	23.1	<0.001
	1	552 (13.6)	107 (13.1)	16.2
	2	367 (9.1)	70 (8.6)	16.0
	3	472 (11.6)	72 (8.8)	13.2
	4	656 (16.2)	107 (13.1)	14.0
	5	1365 (33.7)	265 (32.6%)	16.3
Length of stay (weeks)	≤1	1956 (48.3)	306 (37.6)	13.5	<0.001
	≤2	1410 (34.8)	235 (28.9)	14.3
	≤3	413 (10.2)	151 (18.6)	26.8
	≤4	152 (3.8)	58 (7.1)	27.6
	>4	122 (3.0)	64 (7.9)	34.4
Charlson comorbidity index	0	4042 (99.7)	812 (99.8)	16.7	0.897
	1	11 (0.3)	2 (0.2)	15.4
Residence	Seoul Capital Area	933	143	13.3	0.002
	Metropolitan City	756	150	16.6
	Province	2364	521	18.1

Table 2 Chronic Obstructive Pulmonary Disease Re-Admission Difference According to Emergency TRI

		Total Cases	Mean	SD	t	p
Emergency TRI	Not Readmitted	4053	71.53	19.73	3.9	<0.001
	Readmitted	814	68.56	20.22

Note: P-value by t-test.

Table 3 Factors Affecting COPD Re-Admission. Models 1 and 2 Were Analyzed by Adjusting Individual and Local Characteristic Variables, Respectively

		Model 1			Model 2
		OR	95% CI	P	OR	95% CI	P
Sex	Male	1.754	1.46–2.106	<0.001	1.749	1.456–2.101	<0.001
	Female	1			1
Age (years)	70–74	1.077	0.843–1.381	0.077	1.072	0.836–1.047	0.087
	75–79	0.836	0.669–1.046		0.837	0.669–1.047
	80–84	1.05	0.843–1.308		1.045	0.839–1.302
	≥85	1			1
Insurance quintile	1	1.066	0.806–1.409	0.309	1.056	0.799–1.397	0.319
	2	0.953	0.703–1.29		0.746	0.698–1.282
	3	0.799	0.597–1.071		0.802	0.599–1.075
	4	0.841	0.656–1.078		0.834	0.651–1.07
	5	1			1
Insurance type	Self-employed insured	0.617	0.460–0.827	<0.001	0.618	0.460–0.829	<0.001
	Employee insured	0.673	0.541–0.837		0.672	0.540–0.837
	Medical aid	1			1
Length of stay (weeks)	≤1	0.29	0.208–0.404	<0.001	0.289	0.208–0.403	<0.001
	≤2	0.308	0.22–0.432		0.307	0.219–0.431
	≤3	0.66	0.46–0.947		0.66	0.46–0.948
	≤4	0.691	0.448–1.067		0.692	0.448–1.069
	>4	1			1
Charlson comorbidity index	0	1.033	0.226–4.729	0.914	1.088	0.237–4.991	0.914
	1	1			1
Institution type	District hospital	0.798	0.672–0.947	0.01	0.794	0.669–0.943	0.008
	Hospital	1			1
Residence	Seoul Capital Area	0.74	0.062–0.911	0.016	1.02	0.734–1.417	0.308
	Metropolitan City	0.886	0.721–1.089		1.2	0.878–1.684
	Province	1			1

Abbreviations: OR, odds ratio; CI, confidence interval.