Table 2 Correlations between δ13C, δ15N values and other variables
From: The association between carbon and nitrogen stable isotope ratios of human hair and hypertension
Variable | Correlation coefficients (P-value) | |
|---|---|---|
δ13C, ‰ vs. PDB | δ15N, ‰ vs. air | |
All subjects (n = 392) | ||
 Systolic blood pressure (mmHg) | 0.013 (0.799) | 0.059 (0.247) |
 Diastolic blood pressure (mmHg) | 0.119 (0.018) | 0.117 (0.021) |
 Age (yr) | −0.226 (< 0.001) | − 0.123 (0.015) |
 Body mass index (kg/m2) | 0.063 (0.210) | 0.207 (< 0.001) |
 Waist circumference (cm) | 0.150 (0.003) | 0.316 (< 0.001) |
 Fasting glucose (mg/dL) | 0.037 (0.462) | 0.122 (0.015) |
 HOMA-IR (unit) | −0.033a) (0.519) | 0.072a) (0.152) |
 Total cholesterol (mg/dL) | 0.021 (0.681) | 0.016 (0.746) |
 Triglyceride (mg/dL) | 0.053a) (0.293) | 0.031a) (0.536) |
 HDL cholesterol (mg/dL) | 0.045 (0.378) | −0.120 (0.018) |
 Total energy intake (kcal/day) | 0.145 (0.004) | 0.168 (< 0.001) |
 Sodium intake (mg/day) | 0.003 (0.959) | −0.024 (0.642) |
Subjects without antihypertensive medication (n = 313) | ||
 Systolic blood pressure (mmHg) | 0.042 (0.462) | 0.113 (0.045) |
 Diastolic blood pressure (mmHg) | 0.157 (0.005) | 0.179 (0.001) |
 Age (yr) | −0.231 (< 0.001) | − 0.166 (0.003) |
 Body mass index (kg/m2) | 0.065 (0.252) | 0.174 (0.002) |
 Waist circumference (cm) | 0.165 (0.004) | 0.295 (< 0.001) |
 Fasting glucose (mg/dL) | 0.123 (0.030) | 0.135 (0.017) |
 HOMA-IR (unit) | −0.022a) (0.700) | 0.080a) (0.160) |
 Total cholesterol (mg/dL) | 0.004 (0.937) | 0.070 (0.220) |
 Triglyceride (mg/dL) | 0.114a) (0.043) | 0.052a) (0.360) |
 HDL cholesterol (mg/dL) | 0.002 (0.966) | −0.096 (0.090) |
 Total energy intake (kcal/day) | 0.141 (0.013) | 0.191 (< 0.001) |
 Sodium intake (mg/day) | −0.065 (0.266) | −0.061 (0.298) |