NPPB and respiratory system disorder: Other characteristics, such as gender, temperature, level of C-reactive protein (CRP), history of respiratory disease (odds of having respiratory disease among Low NT-proBNP: 0.065; Medium: 0.072; High: 0.045), and cancer (odds of having cancer among Low NT-proBNP: 0.088; Medium: 0.047; High: 0.045) showed no significant difference between the three groups with different levels of NT-proBNP (Table 1).