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Figure 1 | Respiratory Research

Figure 1

From: Chronic obstructive pulmonary disease and inhaled steroids alter surfactant protein D (SP-D) levels: a cross-sectional study

Figure 1

SP-D levels in BALF according to smoking and disease status. P value shown on the graph is for the overall trend in SP-D levels by a nonparametric test for trend. * p = 0.01 for the difference between healthy former smokers and former smokers with COPD. ** p = 0.45 for the difference between healthy current smokers and current smokers with COPD.

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Respiratory Research

ISSN: 1465-993X

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