Variables influencing PRT obtained using the COX proportional hazards model with backward stepwise selection
| Variables | HR | 95% CI | P value |
| Inpatient | 2.02 | 1.09 to 3.74 | 0.03 |
| Taking diuretic medication | 0.48 | 0.25 to 0.93 | 0.03 |
| Aetiology of oedema | |||
| Cardiac oedema | 2.32 | 1.07 to 5.01 | 0.03 |
| Malnutrition-related oedema | 4.53 | 1.80 to 11.36 | 0.001 |
| Age (year) | 0.96 | 0.94 to 0.99 | 0.002 |
| Thickness of soft tissue in the oedema (mm) | 1.19 | 1.11 to 1.28 | <0.001 |
| Laboratory variables | |||
| Albumin (g/dL) | 1.86 | 1.13 to 3.05 | 0.01 |
| BUN (mg/dL)/sCr (mg/dL) | 1.03 | 1.00 to 1.05 | 0.03 |
| sCr (mg/dL) | 2.37 | 1.44 to 3.89 | <0.001 |
| K (mEq/L) | 0.63 | 0.42 to 0.94 | 0.02 |
| Estimated RVSP (mm Hg) | 0.97 | 0.95 to 0.99 | 0.002 |
BUN, blood urea nitrogen; PRT, pit recovery time; RVSP, right ventricular systolic pressure; sCr, serum creatinine.