Although GOLD 4 subjects had lower SP-D levels than GOLD 2 and 3 subjects (median SP-D levels 201 ng/mL for GOLD 4 and 461 ng/mL for GOLD 2 and 3), this difference did not reach statistical significance (p = 0.37).
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Chronic obstructive pulmonary disease and inhaled steroids alter surfactant protein D (SP-D) levels: a cross-sectional study.
2
0.3700
0.3700
The sentences
reported that a single SP-D gene haplotype had a highly significant negative association with serum SP-D levels.