Fig. 1From: The association between carbon and nitrogen stable isotope ratios of human hair and hypertensionRelation of δ13C and δ15N values to systolic and diastolic blood pressures in 313 subjects without antihypertensive medication. A δ13C. B δ15N. The scatter plots are shown with regression lines (black solid lines) and 95% confidence intervals (gray areas). PDB, Pee Dee BelemniteBack to article page