Table 3. Relationship between respiration and both HRV and HR.

		HF-HRV	RMSSD	HR
Patients (n = 55)	Pearson’s r	−0.29	−0.13	0.31
	p-value	0.03	0.34	0.02
	Upper 95% CI	−0.03	0.14	0.53
	Lower 95% CI	−0.52	−0.38	0.04
Controls (n = 149)	Pearson’s r	−0.04	0.1	−0.02
	p-value	0.6	0.23	0.77
	Upper 95% CI	0.12	0.25	0.14
	Lower 95% CI	−0.2	−0.06	−0.18

Note: HF-HRV = High frequency heart rate variability (log transformed); RMSSD = Root mean square of successive differences; HR = Heart rate.