Table 1.
Characteristics 1 of men and women who collected 24-h urine in the seventh wave of the Tromsø study 2015–2016 (n = 493).
| Men (n = 241) | Women (n = 252) | p-Value, Difference 4 | p-Value, Difference 5 | |
|---|---|---|---|---|
| Age (years) 2 | 56.6 (8.4) | 55.2 (8.4) | 0.053 | 0.052 |
| Urine volume (l/24-h) 2 | 1.70 (0.57) | 1.79 (0.61) | 0.069 | 0.049 |
| Na (mmol/24-h) 2 | 177.9 (69.7) | 129.4 (47.2) | <0.001 | <0.001 |
| K (mmol/24-h) 2 | 99.2 (28.4) | 76.2 (24.5) | <0.001 | <0.001 |
| Na (g/24-h) 2 | 4.09 (1.60) | 2.98 (1.09) | <0.001 | <0.001 |
| K (g/24-h) 2 | 3.87 (1.11) | 2.97 (0.96) | <0.001 | <0.001 |
| Na/K-ratio 2 | 1.86 (0.71) | 1.79 (0.69) | 0.26 | 0.23 |
| Calculated NaCl (g/24-h) 2 | 10.39 (4.07) | 7.55 (2.76) | <0.001 | |
| Calculated NaCl (g/24-h) 3 | 9.73 (2.27–5.0) | 7.13 (1.78–18.9) | <0.001 | |
| Body Mass Index (kg/m2) 2 | 27.6 (3.7) | 26.8 (4.7) | 0.06 | |
| Tertiary education (%) | 51.2 | 51.4 | 0.52 |
1 Sodium (Na), potassium (K), sodium to potassium molar ratio (Na/K ratio). Conversion from mmol to gram is made by multiplying with 0.023 for Na and with 0.039 for K. Conversion from Na to NaCl is made by multiplying with 2.54.2 Mean (SD), 3 Median (range), 4 T-test for means and the chi-squared test for proportions, 5 Mann-Whitney U Test (nonparametric test).