Table 3.
Results of univariate associations
| A. Time domain analyses | ||||
|---|---|---|---|---|
| Variables | Mean RR interval (ms) Estimate (95% Confidence Interval) | P | SDNN (ms) Estimate (95% Confidence Interval) | P |
| Age (per decade) | 3.62 (−0.15, 7.38) | 0.059 | −2.05 (−3.07, −1.03) | 0.0001 |
| Black race (vs. non-black race) | −11.2 (−21.5, −0.85) | 0.034 | 2.29 (−0.6, 5.18) | 0.12 |
| Left ventricular mass (per 10 g) | −1.00 (−1.96, −0.032) | 0.043 | 0.09 (−0.18, 0.36) | 0.51 |
| Hemoglobin (g/dl) | 4.13 (0.059, 8.2) | 0.047 | −0.95 (−2.13, 0.23) | 0.11 |
| SPPB (per unit) | 1.98 (0.09, 3.87) | 0.041 | 0.58 (0.049, 1.10) | 0.032 |
| Calcium channel blocker | −12.9 (−23.2, −2.5) | 0.015 | 1.54 (−1.38, 4.45) | 0.30 |
| B. Frequency domain analyses | ||||||
|---|---|---|---|---|---|---|
| Variables | LogHF (95% Confidence Interval) | P | Log LF (95% Confidence Interval) | P | LF/HF (95% Confidence Interval) | P |
| Left ventricular mass (per 10 g) | −0.018 (−0.0035, −0.0043) | 0.045 | −0.017 (−0.041, 0.0067) | 0.16 | 0.00047 (−0.040, 0.041) | 0.98 |
| Calcium channel blocker | −0.35 (−0.53, −0.17) | 0.0002 | −0.37 (−0.62, −0.11) | 0.005 | 0.02 (−0.42, 0.46) | 0.93 |
SPPB, short physical performance battery score; SDNN, SD of RR intervals; HF, high-frequency harmonic.