Table 2.

Measures of HRV Mean (SD) Change Scores and ANCOVA Results for BBT-CI and HEAL Arms at Pre- and Post-Intervention

	BBT-CI					HEAL					ANCOVA
				95% Confidence Interval					95% Confidence Interval					95% Confidence Interval
Pre- and Post-Intervention Differences	Mean Change (SD)	t	Estimate	Lower Bound	Upper Bound	Mean Change (SD)	t	Estimate	Lower Bound	Upper Bound	Estimate	SE	p	Lower Bound	Upper Bound
SDNN	0.41 (6.60)	0.23	0.06	−3.40	4.22	−4.76 (4.78)	−2.99	−0.73	−8.43	−1.08	5.56	2.22	<0.01	0.93	10.20
rMSSD	0.94 (5.53)	0.63	0.20	−2.26	4.13	−3.40 (2.72)	−3.75	−1.11	−5.49	−1.31	5.18	1.91	<0.01	1.19	9.16
HF Power	0.09 (0.83)	0.40	0.12	−0.39	0.57	−1.04 (1.17)	−2.67	−1.33	−1.94	−0.14	1.20	0.42	<0.01	0.33	2.07
LF/HF	0.39 (1.98)	0.73	0.13	−0.75	1.53	1.42 (3.40)	1.25	0.52	−1.20	4.03	−1.00	1.14	0.39	−3.39	1.38
Mean Heart Rate	0.18 (9.71)	0.07	0.01	−5.43	5.79	8.26 (12.89)	1.92	0.91	−1.65	18.16	−7.91	4.68	0.11	−17.67	1.86

Note: SDNN = Standard Deviation of all Normal to R-R Intervals; rMSSD = Root Mean Square of Successive Differences; HF = High Frequency Power; LF/HF = Low Frequency/High Frequency Power Ratio