Table 2

Cellular characteristics and DNA yield of induced sputum

Smokers (mean ± SD)Nonsmokers (mean ± SD)
Total cell count (× 106)6.7 ± 6.04.7 ± 6.0
Viability (%)80 ± 15a63 ± 17
Squamous cells (%)17 ± 1316 ± 12
Nonsquamous cells (%)83 ± 1384 ± 12
BAMs (%)69 ± 24b92 ± 5
Neutrophils (%)26 ± 26c4 ± 4
Bronchoepithelial cells (%)5 ± 53 ± 4
Lymphocytes (%)0.3 ± 0.50.3 ± 0.5
Methachromatic cells (%)0.2 ± 0.60.2 ± 0.6
DNA yield (μg)56 ± 5530 ± 35
  • a Statistically significant compared to nonsmokers; P = 0.01.

  • b Statistically significant compared to nonsmokers; P = 0.002.

  • c Statistically significant compared to nonsmokers; P = 0.008.