Table 3. The relation between OH and frailty status by Binary Logistic Regression Analysis.

	Between robust and frail group*
	Odds ratio		95% CI	P
OH1	3.392		1.086–10.598	0.032
OH3	1.008		0.395–2.557	0.986
OH5	1.162		0.452–2.991	0.755
	Between pre-frail and frail group*
	Odds ratio		95% CI	P
OH1	2.025		1.144–3.585	0.015
OH3	1.973		1.095–3.558	0.067
OH5	1.568		0.893–2.754	0.117
	Between pre-frail and robust group*
	Odds ratio		95% CI	P
OH1	2.034		0.879–4.709	0.097
OH3	0.517		0.241–1.109	0.090
OH5	0.663		0.316–1.390	0.276

*Independently age, sex, year of education, presence of dementia, hypertension, Parkinson's disease, depression and falls, use of calcium channel blocker, alpha blocker, diuretic and antidepressant drugs, level of hemoglobin, albumin and eGFR, basic and instrumental ADLs. ADLs: Barthel Activities of Daily Living index. eGFR: estimated glomerular filtration rate; OH₁: orthostatic hypotension within 1^st min measured by head-up Tilt Table Test; OH₃: orthostatic hypotension within 3^rd min measured by head-up Tilt Table Test; OH₅: orthostatic hypotension within the 5^th min measured by head-up tilt table test.