Table 1.
Baseline Characteristics of Study Participants Across Quartiles of Dietary Sodium and Potassium Intake
| Characteristics | Sodium Intake, mg/d | P Value | Potassium Intake, mg/d | P Value | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ≤2190 | 2191–3142 | 3143–4349 | >4349 | ≤1771 | 1772–2529 | 2530–3450 | >3450 | |||
| Mean age (SD), y | 43.6±0.5 | 42.4±0.6 | 41.9±0.5 | 38.9±0.6 | <.01 | 39.3±0.5 | 42.1±0.6 | 42.3 ±0.6 | 42.1±0.6 | .01 |
| Male sex, % | 31.0 | 39.1 | 49.8 | 73.5 | <.01 | 30.5 | 41.4 | 52.7 | 70.0 | <.01 |
| Race, % | ||||||||||
| Non‐Hispanic black | 11.5 | 10.9 | 6.8 | 9.0 | <.01 | 15.1 | 10.4 | 7.3 | 5.8 | <.01 |
| Non‐Hispanic white | 67.8 | 71.8 | 75.1 | 75.7 | 65.3 | 70.1 | 77.1 | 77.0 | ||
| Mexican American | 10.1 | 9.8 | 8.8 | 8.1 | 9.3 | 10.0 | 7.7 | 9.7 | ||
| Diabetes, % | 3.3 | 3.6 | 3.3 | 2.5 | .73 | 3.2 | 3.5 | 2.7 | 3.2 | .78 |
| BP >140/90 mm Hg, % | 10.6 | 7.9 | 8.2 | 7.9 | <.09 | 7.9 | 9.8 | 9.4 | 7.3 | .21 |
| BP >130/80 mm Hg, % | 26.2 | 25.0 | 25.4 | 24.7 | .91 | 22.8 | 27.1 | 26.2 | 24.7 | .12 |
| BMI, kg/m2 | 26.7±0.2* | 26.9±0.2* | 27.5±0.2 | 27.5±0.2 | .01 | 27.5±0.2 | 27.3±0.2 | 27.0±0.2 | 26.9±0.2 | .18 |
| eGFR, mL/min/1.73 m2 | 90.0±0.9* | 90.7±1.0 | 90.4±0.8 | 93.1±0.8 | .01 | 93.2±0.7 | 91.0±0.9* | 90.5±0.9* | 89.9±0.8* | .01 |
| SBP, mm Hg | 117.7±0.6 | 117.3±0.4 | 117.9±0.5 | 117.4±0.4 | .74 | 116.2±0.5 | 118.4±0.6* | 118.5±0.5* | 117.1±0.4 | .01 |
| DBP, mm Hg | 70.1±0.4 | 69.8±0.4 | 70.8±0.4 | 70.4±0.4 | .15 | 69.7±0.4 | 70.1±0.4 | 70.8±0.4 | 70.5±0.3 | .08 |
Values are expressed as mean±standard error unless otherwise specified. Abbreviations: BMI, body mass index; BP, blood pressure; DBP, diastolic blood pressure; eGFR, estimated glomerular filtration rate; SBP, systolic blood pressure. *P <0.05 compared to the 1st quartile.