Table 4.

Multiple regression analyses of association between interhospital transfer and ED length of stay or in-hospital outcomes in various subgroups.

	ED LOS	Hospital LOS	In-hospital death
	Adjusted β (95% CI)	Adjusted β (95% CI)	Adjusted OR (95% CI)
Five-level Taiwan triage and acuity scale
1 and 2 (n = 7341)	−312.23 (−465.22, −159.25)	0.72 (−0.02, 1.47)	1.13 (0.91, 1.41)
≥3 (n = 10810)	−224.36 (−377.98, −70.73)	1.51 (0.79, 2.23)	1.62 (1.18, 2.24)
Ambulance arrivals (n = 4968)	−241.7 (-376.8, −106.7)	−0.19 (−0.90, 0.52)	0.76 (0.62, 0.93)
Cardiovascular disorders
Congestive heart failure (n = 1538)	−142.05 (−466.35, 182.25)	0.74 (−0.62, 2.10)	1.21 (0.61, 2.41)
Myocardial infarction (n = 568)	−339.10 (−733.28, 55.07)	−0.29 (−1.82, 1.22)	0.64 (0.25, 1.63)
Neurological disorders
Cerebrovascular disease (n = 1732)	−338.28 (−655.33, −21.23)	1.15 (−0.59, 2.90)	1.59 (0.88, 2.88)
Endocrine disorders
Diabetes without chronic complication (n = 2686)	−539.69 (−863.83, −215.56)	0.78 (−0.79, 2.36)	1.14 (0.62, 2.11)
Diabetes with chronic complication (n = 769)	−554.37 (−1253.54, 144.79)	0.01 (−3.52, 3.56)	0.70 (0.14, 3.51)
Hematologic and oncologic disorders
Any malignancy (n = 1630)	−55.32 (−460.11, 349.46)	1.13 (−1.10, 3.37)	0.76 (0.44, 1.29)
Renal and genitourinary disorders
Chronic kidney disease (n = 1547)	−416.62 (−823.89, −9.36)	0.90 (−1.25, 3.05)	0.71 (0.30, 1.64)
Pulmonary disorders
Chronic pulmonary disease (n = 1073)	9.97 (−465.78, 485.73)	−0.51 (−2.79, 1.77)	1.76 (0.72, 4.30)
Gastrointestinal disorders
Mild liver disease (n = 878)	−261.89 (−784.58, 260.79)	1.45 (−1.09, 3.99)	1.00 (0.45, 2.22)
Peptic ulcer disease (n = 611)	57.44 (−414.13, 529.03)	−0.38 (−2.14, 1.37)	0.87 (0.19, 3.89)

LOS, length of stay; β, regression coefficient; OR, odds ratio; CI, confidence interval.

Non-IHT was used as the reference group for analyses.

Adjusted β or OR was obtained after adjustment for all potential confounders. Numbers in bold format indicate P < 0.05.