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. Author manuscript; available in PMC: 2016 Jan 4.
Published in final edited form as: Am J Hum Biol. 2014 Oct 1;27(2):184–191. doi: 10.1002/ajhb.22636

TABLE 3.

Mean values and 95% confidence intervals (CIs) of HRV across tertiles of leptin

Tertiles of leptin
First tertile
16–5,781 (n=129)
Second tertile
5,806–13,123 (n=130)
Third tertile
13,128–91,581 (n=129)
P-value
High frequency
 Model 1 172.7 (141.5–210.9) 148.4 (121.6–181.1) 116.4 (95.3–142.1) 0.087
 Model 2 166.4 (137.9–200.7) 147.4 (122.3–177.6) 121.7 (100.8–146.8) 0.144
 Model 3 172.5 (142.4–209.0) 149.2 (124.0–179.6) 112.8 (93.2–136.5) 0.028
Low frequency
 Model 1 238.9 (204.4–279.2) 232.2 (198.8–271.3) 154.1 (131.9–180.2) <0.001
 Model 2 233.3 (200.8–271.1) 231.2 (199.2–268.4) 158.5 (136.4–184.2) <0.001
 Model 3 231.9 (198.4–271.2) 231.2 (198.8–269.0) 159.4 (136.4–186.2) 0.001

HF and LF HRV were first log-transformed for analysis, 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.