Table 2.

Bronchoalveolar lavage fluid SP-D and phospholipids

	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.

Shown are means ± standard deviations; P values were calculated using ln transformed data (see Additional File 1: Supplemental Table S1).