CD4 and lymphoma: The percentage of CD4+CD8+ cells was statistically higher in double positive lymphoma (mean = 85.9, s.d. = 12.3, median = 85.5, range 67.7–99.8) than in non-lymphoma samples (mean = 46.5, s.d. = 29.2, median = 48.4, range 2.7–78.8) (P = 0.006).