Group | CD8+ | CD68+ | NE | CD4+ | IL-8 | TNF-α | ||||||
Parallel | Within | Parallel | Within | Parallel | Within | Parallel | Within | Parallel | Within | Parallel | Within | |
Number of airways | ||||||||||||
1 | 47 | 19 | 41 | 16 | 130 | 48 | 31 | 12 | 132 | 44 | 36 | 13 |
2 | 32 | 14 | 25 | 11 | 80 | 32 | 23 | 10 | 86 | 32 | 26 | 11 |
NE: neutrophil elastase; IL: interleukin; TNF: tumour necrosis factor. #: number of subjects required per group to detect at least one doubling difference in cell number with α = 0.05 and β = 0.20.