Table 2.

Relationship Between Frailty Index and Hemodynamic Function Within 30 Seconds of Standing Estimated by Statistical Parametric Mapping

	Clusters	Association of Frailty Index
		Univariate Regression				Multivariate Regression
		Temporal Range (s)	Duration (s)	t Value	p Value	Temporal Range (s)	Duration (s)	t Value	p Value
Heart rate	1	0.9–19.3	18.5	−2.56	.0005	0.8–17.5	16.6	−2.56	0.0011
Systolic blood pressure	2	4.7–13.2	8.5	2.54	.0218	5.3–15.6	10.2	2.54	0.0149
		18.4–24.4	6.0	−2.54	.0328
Tissue saturation index	1	17.7–29.0	11.3	−2.48	.0199	20.1–26.9	6.8	−2.47	0.0363

Notes: The alpha level was set at 0.05 for all analysis and specific p values are reported for each significant region of the curve analyzed. Univariate regression considered the association of higher frailty index on dependent variables. Multivariate regressions used the same model with the addition of covariates sex, age, and an age-squared term (to account for potentially nonlinear association with age). Temporal range is consistent with the period following standing (in seconds) over which significant differences between curves were identified. Extent is analogous with duration of the significant region of the curve.