| Plasma NT-proBNP levels, ng/L | PREFER | Control | P |
| Baseline, mean ± SD | 11,893 ± 15,416 N = 36 | 5407 ± 5280 N = 36 | 0.021 |
| End of study, mean ± SD | 7764 ± 10086 N = 28 | 5608 ± 6398 N = 32 | 0.330 |
| Mean ± SD of differences (baseline to end of study) | 1332 ± 7243 | −634 ± 4735 | 0.210 |
| Logarithmic baseline, mean ± SD | 3.80 ± 0.52 | 3.56 ± 0.42 | 0.028 |
| Logarithmic end of study, mean ± SD | 3.63 ± 0.48 | 3.52 ± 0.47 | 0.350 |
| Mean ± SD differences (Log baseline vs log end of study) | 0.12 ± 0.33 | 0.0053 ± 0.30 | 0.180 |
| Categorised difference: | N = 28 | N = 32 |
|
| Improved NT-proBNP | 20 | 16 | 0.091 |
| Impaired NT-proBNP | 8 | 16 | 0.091 |