Table 3.

Regression models for the effect of diagnostic groups and control parameters on respiratory sinus arrhythmia, epoch-to-epoch autoregressive stability, and number of nonspecific heart rate accelerations.

	Respiratory Sinus Arrhythmia1					Autoregressive Stability of Heart Rate1					Number of Heart Rate Accelerations2
	β	SE	t	p	d	β	SE	t	p	d	β	SE	t	p	d
Intercept	.223	.003	72.33	< .001	--	.623	.036	17.51	< .001	--	3.222	.063	50.90	< .001	--
PTSD	−.002	.005	−.47	.64	.14	−.052	.048	−1.08	.28	.31	.193	.093	2.08	.04	.60
PTSD+PD	.0003	.004	.07	.95	.03	−.056	.051	−1.09	.28	.38	.498	.096	5.16	< .001	1.81
PD	.0003	.004	.06	.95	.03	−.112	.050	−2.28	.03	.87	.645	.087	7.41	< .001	2.82
Gender	.011	.003	3.49	.001	.59	.107	.036	3.02	.004	.51	−.241	.063	−3.81	< .001	.65
Age	−.002	.003	−.98	.33	.17	.005	.002	3.18	.002	.54	−.019	.003	−6.72	< .001	1.14
BMI	.004	.003	1.01	.31	.17	.004	.004	1.05	.30	.18	−.012	.007	−1.61	.11	.27
SSRI	−.0002	.003	−.06	.95	.03	.022	.016	1.37	.18	.53	−.208	.037	−5.66	< .001	2.22
AntiDep	.009	.003	2.72	.008	1.06	.006	.017	.38	.71	.15	−.118	.039	−3.00	.003	1.17
TS Length	.003	.003	.78	.44	.13	.0001	.0001	.74	.46	.13	.001	.0002	5.50	< .001	.94

Reference group = healthy controls; PTSD = post-traumatic stress disorder; PD = panic disorder; BMI = body mass index; SSRI = selective serotonin reuptake inhibitor; AntiDep = non-SSRI antidepressant medications; TS Length = length of time series;

¹= estimated via robust linear regression;

²= estimated via generalized linear regression with Poisson distribution; d = Cohen’s d (calculated as d = t*sqrt[2/n]).