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Overall death rate (n = 33) of 819 coronary artery bypass patients grouped according to quartiles of serum N-terminal pro-brain type natriuretic peptide (NT-proBNP) levels.
| Quartile | NT-pro-BNP (ng/l) | n | deaths |
| 1 | 66 (6–122) | 203 | 1 |
| 2 | 194 (123–291) | 207 | 6 |
| 3 | 502 (296–808) | 204 | 8 |
| 4 | 1704 (810–65,998) | 205 | 18 |
The difference between the groups was statistically significant (p<0.001).
