NPPB and cancer: Similarly, for patients with digestive system cancer, the estimated log odds were -0.742, yielding an odds ratio of 0.476 (95% CI: 0.0668-3.40), with a p-value of 0.459. This suggests that digestive system cancer patients are less likely to have NT-proBNP levels above 600 ng/L compared to those with cancers in other locations, though this result was also not statistically significant.