| Before enrichment | After enrichment | |
| Total cell count cells ×106 | 14.2±13.5 | 8.84±8.9 |
| Total neutrophil count cells ×106 | 10.3±9.7 | 8.0±8.2 |
| Neutrophil % | 73.5±4.6 | 89.5±3.1 |
| Total macrophage count cells ×106 | 3.3±3.5 | 0.7±0.6 |
| Macrophage % | 22.5±4.4 | 9.0±3.6 |
| Eosinophil % | 1.0 (0.5–1.8) | 0 (0–1.75) |
| Lymphocyte % | 0.3 (0–1.8) | 0 (0–0.5) |
| Squamous cell % | 1 (0–1.75) | 0.25 (0–3.75) |
Data are presented as mean±sd or median (range). Differential cell counts for sputum samples used for cell culture pre- and post-neutrophil isolation step (n=7). Cell numbers are normalised per gramme of sputum.