. Author manuscript; available in PMC: 2010 Oct 1.

Published in final edited form as: Psychosom Med. 2009 Aug 6;71(8):821–827. doi: 10.1097/PSY.0b013e3181b39aa1

Table 4.

Association between depression and HRV indices of autonomic nervous system activity

	Unadjusted mean			Adjusted mean^*
	No Depression BDI < 10 mean±s.e.m.	Depression BDI ≥ 10 mean±s.e,m.	p ^a	No Depression BDI < 10 mean±s.e,m.	Depression BDI ≥ 10 mean±s.e,m.	p
RMSSD (ms)	24.97 ± 2.44	15.25 ± 1.66	0.002	24.72 ± 2,19	15.85 ± 3.57	0.047
pNN50 (%)	5.61 ± 1.04	1.83 ± 0.77	0.006	5.64 ± 0.93	1.75 ± 1.51	0.040
SDNN (ms)	112.0 ± 6.13	107.4 ± 10.50	0.70	110.76 ± 6.27	110.86 ± 10.60	0.99
HF (ln.ms²)	4.27 ± 0.18	3.71 ± 0.21	0.087	4.27 ± 0.16	3.72 ± 0.27	0.092
LF (ln.ms²)	5.28 ± 0.22	5.08 ± 0.31	0.62	5.30 ± 0.21	5.03 ± 0.34	0.51
LF/HF	1.25 ± 0.03	1.37 ± 0.05	0.061	1.26 ± 0.03	1.35 ± 0.05	0.16

adjusted for age, sex, hypertension and diabetes status.

unadjusted p values were calculated using unpooled variances and adjusted degrees of freedom if homogeneity of variance was not present (i.e., Levene’s test for equivalence of variance p < 0.05; RMSSD and PNN50).