Cox multivariable regression analysis for all-cause mortality in the 2004–5 cohort
| Variable | Unit | HR (95% CI) | p Value |
| Age | years | 1.09 (1.05 to 1.13) | <0.001 |
| Sodium | mmol/l | 0.90 (0.85 to 0.94) | <0.001 |
| Urea* | mmol/l | 2.46 (1.46 to 4.15) | 0.001 |
| QRS duration† | ms | 1.78 (1.03 to 3.07) | 0.040 |
| SBP‡ | mm Hg | 1.81 (1.03 to 3.19) | 0.040 |
*Urea ⩾10 mmol/l versus rest; †QRS duration >100 ms versus rest; ‡systolic blood pressure (SBP) <115 mm Hg versus rest.