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Table 2 Bronchoalveolar lavage fluid SP-D and phospholipids

From: Smoking reduces surfactant protein D and phospholipids in patients with and without chronic obstructive pulmonary disease

  Never Smoker Smokers  
   Control COPD P
BAL SP-D (uncorrected) ng/ml 558 ± 309 287 ± 204 235 ± 203 <0.0001
BAL SP-D (corrected) μg/ml 51.9 ± 64.3 16.0 ± 19.3 19.1 ± 20.5 <0.0001
BAL phospholipid (nmol/ml) 14.8 ± 7.4 8.9 ± 7.8 8.5 ± 7.7 <0.0001
BAL SP-D ng/phospholipid nmol 42.2 ± 31.5 52.1 ± 61.8 44.8 ± 33.3 N.S.
  1. Shown are means ± standard deviations; P values were calculated using ln transformed data (see Additional File 1: Supplemental Table S1).