Table 1.
Baseline characteristics of the study population in the Korean National Health and Nutrition Examination Survey VI (2014 to 2015)
| Characteristic | Total population (n = 3,645, weighted n = 29,532,753) |
|
|---|---|---|
| No. of subjects (weighted %) | Median (IQR)a | |
| Age, yr | 41 (25–56) | |
| 10–18 | 546 (12.0) | |
| 19–29 | 626 (18.5) | |
| 30–44 | 887 (25.2) | |
| 45–59 | 948 (26.8) | |
| 60–75 | 638 (17.5) | |
| Sex | ||
| Male | 1,817 (52.5) | |
| Female | 1,828 (47.5) | |
| Body weight, kg | 62.2 (54.5–71.5) | |
| Body mass index, kg/m2 | 23.3 (20.9–25.7) | |
| < 25 | 2,504 (68.0) | |
| ≥ 25 | 1,141 (32.0) | |
| Hypertensiona | ||
| Yes | 694 (19.3) | |
| No | 2,951 (80.7) | |
| Creatinine, mg/dL | 0.8 (0.7–0.9) | |
| Dietary sodium intake, mg/day | 3,451 (2,258–5,086) | |
| < 2,000 | 729 (19.1) | |
| 2,000–5,000 | 1,974 (54.2) | |
| > 5,000 | 942 (26.7) | |
| Urinary sodium, mmol/L | 113 (80–150) | |
| < 80 | 887 (24.3) | |
| 80–150 | 1,830 (50.7) | |
| > 150 | 928 (25.0) | |
| UIC, µg/L | 292 (157–672) | |
| < 100 | 414 (11.3) | |
| 100–300 | 1,446 (39.7) | |
| > 300 | 1,785 (49.0) | |
| Urinary I/Cr ratio, µg/g | 195 (104–478) | |
| < 85 | 646 (18.1) | |
| 85–220 | 1,324 (36.4) | |
| > 220 | 1,675 (45.5) | |
| Urinary creatinine, mg/dL | 154 (101–220) | |
IQR, interquartile range; UIC, urinary iodine concentration; I/Cr, iodine/creatinine.
a
Hypertension included those who had previously been diagnosed with hypertension or who had a systolic blood pressure greater than 140 mmHg or more or a diastolic blood pressure greater than 90 mmHg or more.