Table 2.

Unadjusted and adjusted relative rates of revisits to ED within 72 hours of discharge in adults with chronic diseases (24,206 ED discharges)

Factor	Bivariate analysis				Multivariate analysis
	95% CI for RR				95% CI for aRR
	P-value	RR	Lower	Upper	P-value	aRR	Lower	Upper
Elderly (≥60 years)	0.001a	1.58	1.46	1.70	0.001a	1.60	1.41	1.83
Female	0.461	1.03	0.95	1.11	0.001a	1.24	1.09	1.41
Health insurance coverage	0.001a	3.85	2.76	5.38	0.001a	4.23	2.60	6.90
Weekend ED arrival	0.001a	2.41	2.15	2.69	0.041a	2.13	1.03	4.41
New patient	0.001a	1.42	1.23	1.65	0.001a	1.47	1.25	1.73
Blood	0.103	0.81	0.63	1.04	0.382	2.47	0.33	18.67
Cause of morbidity or mortality	0.087	0.72	0.50	1.05	0.753	1.41	0.17	11.89
Kidney disease	0.052	0.68	0.46	1.00	0.362	2.60	0.33	20.43
Circulatory	0.001a	0.50	0.44	0.58	0.743	1.40	0.19	10.27
Digestive	0.052	0.83	0.68	1.00	0.478	2.09	0.27	15.88
Ear	0.047a	0.57	0.33	0.99	0.726	1.51	0.15	15.17
Endocrine	0.001a	0.56	0.45	0.71	0.675	1.54	0.20	11.65
External causes	0.001a	0.58	0.45	0.73	0.793	1.35	0.14	12.55
Eye adnexa	0.022a	0.62	0.41	0.93	0.939	1.09	0.12	10.14
Factors influencing health	0.001a	0.50	0.37	0.68	0.750	1.40	0.18	11.07
Genitourinary	0.353	0.94	0.82	1.07	0.296	2.90	0.39	21.30
Infectious	0.701	1.12	0.64	1.95	0.517	2.57	0.15	44.57
Metabolic	0.055	0.71	0.50	1.01	0.674	0.61	0.06	6.07
Musculoskeletal system	0.001a	0.59	0.44	0.78	0.176	0.14	0.01	2.38
Neoplasm	0.121	1.40	0.91	2.15	0.152	5.24	0.54	50.49
Nervous	0.246	0.74	0.45	1.23	0.333	3.39	0.29	40.03
Pregnancy childbirth	0.026a	1.33	1.04	1.71	0.110	5.90	0.67	51.96
Respiratory	0.013a	0.78	0.64	0.95	0.754	0.70	0.08	6.48
Skin subcutaneous	0.459	0.84	0.53	1.34	1.000	1.00	0.06	16.74
Others	0.017a	0.60	0.40	0.91	0.285	3.14	0.39	25.51

Note:

^aSignificant at α=0.05.

Abbreviations: aRR, adjusted relative risk; ED, emergency department; GU, genitourinary; MSK, musculoskeletal system; RR, relative risk.