TABLE 5.
Mean values and 95% confidence intervals (CIs) of HRV across tertiles of leptin, stratified by percent body fat
| Tertiles of leptin |
||||
|---|---|---|---|---|
| First tertile | Second tertile | Third tertile | P-value | |
| Body fat <25.5% | 16–4,024 (n=70) | 4,035–7,435 (n=71) | 7,533–91,581 (n=70) | |
| High frequency | ||||
| Model 1 | 188.1 (142.3–248.8) | 137.8 (104.4–181.9) | 148.2 (112.1–196.0) | 0.347 |
| Model 2 | 182.5 (142.5–233.7) | 135.2 (105.8–172.9) | 155.7 (121.6–199.4) | 0.256 |
| Model 3 | 180.2 (140.1–231.7) | 129.8 (101.2–166.5) | 155.3 (120.7–199.8) | 0.283 |
| Low frequency | ||||
| Model 1 | 260.8 (210.1–323.9) | 218.1 (175.9–270.4) | 231.0 (186.1–286.9) | 0.418 |
| Model 2 | 256.6 (209.0–315.0) | 215.8 (176.1–264.6) | 237.3 (193.3–291.3) | 0.366 |
| Model 3 | 259.6 (210.0–321.0) | 215.2 (174.5–265.5) | 235.3 (190.3–291.1) | 0.348 |
| Body fat ≥ 25.5% | 784–12,277 (n=59) | 12,396–19,639 (n=59) | 20,032–73,657 (n=59) | |
| High frequency | ||||
| Model 1 | 149.5 (112.2–199.2) | 100.1 (75.1–133.4) | 147.8 (110.9–196.9) | 0.625 |
| Model 2 | 149.9 (113.1–198.6) | 96.5 (72.7–128.0) | 152.9 (115.3–202.8) | 0.672 |
| Model 3 | 154.0 (115.7–205.0) | 103.1 (77.4–137.3) | 140.0 (104.9–187.0) | 0.317 |
| Low frequency | ||||
| Model 1 | 216.7 (172.7–272.0) | 171.7 (136.8–215.5) | 138.2 (110.1–173.5) | <0.001 |
| Model 2 | 217.2 (173.8–271.3) | 166.7 (133.3–208.5) | 142.0 (113.6–177.6) | <0.001 |
| Model 3 | 218.4 (173.4–275.1) | 162.2 (128.7–204.3) | 146.0 (115.7–184.3) | 0.001 |
HF and LF HRV were first log-transformed, and then the results were back-transformed for reporting. P-values were obtained from linear regression models. Model 1: unadjusted; Model 2: adjusted for age; and Model 3: adjusted for age, gender, and race/ethnicity. P-value for interaction by percent body fat in the association between leptin and HF HRV=0.748; leptin and LF HRV=0.010.