Table 3.

Results of the regression analyses (backward selection): remaining significant correlates of physical health status characterized by Short Form 36 physical composite scores and Cumulative Illness Rating Scale for Geriatrics scores. Adjusted R² of the full model for SF-36 scores=0.28 and for CIRS-G scores=0.33.

Parameter		Estimate	Naïve SE	Naïve z	Robust SE	Robust z	P value
SF-36a physical composite score
	Intercept	22.01	5.81	3.79	6.05	3.64	≤.001
	HRV TIb	1.58	0.47	3.38	0.44	3.58	≤.001
	Gender	5.88	3.01	1.96	2.79	2.11	.04
	Antihypertensives	−5.95	2.71	−2.20	2.53	−2.35	.02
	Smoking status	6.72	2.71	2.48	2.46	2.73	.006
CIRS-Gc score
	Intercept	8.62	3.02	2.85	2.80	3.07	.002
	HRV TId	−0.46	0.14	−3.41	0.10	−4.56	≤.001
	Gender	−1.56	0.89	−1.75	0.81	−1.93	.05
	BMIe	0.15	0.09	1.70	0.07	1.96	.05
	Antihypertensives	2.52	0.83	3.05	0.71	3.57	≤.001
	Antidepressants	1.34	0.91	1.47	0.95	1.41	.16

^aSF-36: short form 36.

^bHRV TI: heart rate variability triangular index

^cCIRS-G: Cumulative Illness Rating Scale for Geriatrics.

^dHRV: heart rate variability.

^eBMI: body mass index.