Table 4 Test-retest correlation of physiological measures during the resting scan.

From: Multimodal neuroimaging data from a 5-week heart rate variability biofeedback randomized clinical trial

Age group

Respiration rate (Hz)

Heart rate (bpm)

ETCO2(mmHg)

Younger adults

r(68) = 0.69, p < 0.001

r(80) = 0.53, p < 0.001

r(44) = 0.50, p < 0.001

Older adults

r(40) = 0.81, p < 0.001

r(41) = 0.89, p < 0.001

r(42) = 0.80, p < 0.001

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