Table 4 Relative risk of hospitalization based on univariate and multivariate Cox proportional hazards models

Risk factor (reference)	All patients (n = 144)				Hypertensive patients (n = 102)
	Hazard ratio (95% confidence interval)				Hazard ratio (95% confidence interval)
	Univariate	p	Multivariate	p	Univariate	p	Multivariate	p
SBP (≥124 mmHg)	2.27 (1.24–4.16)	<0.01	5.37 (2.03–14.21)	<0.01	2.28 (1.09–4.75)	0.03	7.41 (1.80–30.52)	<0.01
Age, years	0.97 (0.94–1.00)	0.06	0.95 (0.90–1.00)	0.07	0.97 (0.94–1.02)	0.22	0.97 (0.89–1.05)	0.45
Sex (women)	1.87 (1.05–3.31)	0.03	3.26 (1.27–8.39)	0.01	2.14 (1.05–4.34)	0.04	6.46 (1.32–31.67)	0.02
Level of care need^a (level < 3)	1.11 (0.59–2.06)	0.75	1.29 (0.48–3.48)	0.61	0.86 (0.41–1.84)	0.70	1.74 (0.43–7.10)	0.44
Heart failure (none)	0.79 (0.36–1.77)	0.57	1.51 (0.48–4.75)	0.48	0.86 (0.37–2.00)	0.73	1.72 (0.47–6.30)	0.42
Bone and joint diseases^b (none)	1.16 (0.61–2.19)	0.66	0.64 (0.24–1.75)	0.39	1.15 (0.51–2.57)	0.74	0.79 (0.18–3.48)	0.76
Respiratory disease^c (none)	1.26 (0.61–2.60)	0.54	0.83 (0.27–2.53)	0.75	1.50 (0.62–3.66)	0.37	0.93 (0.23–3.67)	0.92
Dementia (none)	1.71 (0.89–3.30)	0.11	0.92 (0.34–0.76)	0.86	2.04 (0.84–4.98)	0.12	1.60 (0.31–8.25)	0.58
Pressure sores (none)	1.09 (0.49–2.44)	0.83	0.91 (0.25–3.29)	0.89	0.96 (0.34–2.74)	0.94	0.90 (0.13–6.46)	0.92
Serum albumin, mg/dL	0.60 (0.34–1.05)	0.07	0.34 (0.15–0.76)	<0.01	0.70 (0.34–1.46)	0.34	0.32 (0.11–0.90)	0.03
The period of receiving home medical care until the survey, days	1.00 (1.00–1.00)	0.23	1.00 (1.00–1.00)	0.85	1.00 (1.00–1.00)	0.20	1.00 (1.00–1.00)	0.72

Data are presented as hazard ratios (95% confidence interval)
^aScores range from 0 to 5, with higher values indicating greater disability
^bIncluding fracture, osteoarthritis, articular rheumatism, osteoporosis
^cIncluding chronic respiratory failure, chronic obstructive pulmonary disease, pulmonary emphysema, interstitial pneumonia

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