NPPB and myalgic encephalomeyelitis/chronic fatigue syndrome: As secondary analysis, CFS resulted to exert a stronger capacity to predict the composite endpoint, compared to CCI and BNP level (respectively, AUC 0.702 [95% CI 0.659–0.745], 0.581 [95% CI 0.534–0.628] and 0.597 [95% CI 0.550–0.644]).