NPPB and congestive heart failure: Following the exclusion of 138 duplicate entries for patients enrolled in both studies (due to inappropriate re-referral of patients enrolled in UK-HEART-2 through the NT-proBNP pathway for a new diagnosis of CHF), the combined dataset consisted of 2388 unique patients, who had a mean age of 73.7 ± 13.3 years and 1525 (63.9%) were male.